| Municipal High Yield Advantage Fund Statement of Additional Information November 28 2025 | The Statement of Additional Information offers detailed information about the fund's policies, operations, management, investments and risks. | November 28 2025 | |
| Muni and Stock Advantage Fund Summary Prospectus November 26 2025 | The fund's Summary Prospectus contains information including the fund's investment objective and strategies, principal investments, risks of investing in the fund, and sales charges, management fees and other expenses. | November 26 2025 | |
| SDG (Sustainable Development Goals) Engagement Equity Fund Prospectus November 26 2025 | The fund's Prospectus contains information including the fund's investment objective and strategies, principal investments, risks of investing in the fund, and sales charges, management fees and other expenses. | November 26 2025 | |
| SDG (Sustainable Development Goals) Engagement Equity Fund Statement of Additional Information November 26 2025 | The Statement of Additional Information offers detailed information about the fund's policies, operations, management, investments and risks. | November 26 2025 | |
| MDT Market Neutral ETF (Exchange-Traded Fund) Quarter 3 Holdings November 26 2025 | Third quarter holdings based on fund's fiscal year end. | November 26 2025 | |
| Corporate Bond Strategy Portfolio Quarter 3 Holdings November 26 2025 | Third quarter holdings based on fund's fiscal year end. | November 26 2025 | |
| Fund for U.S. (United States) Government Securities II Quarter 3 Holdings November 26 2025 | Third quarter holdings based on fund's fiscal year end. | November 26 2025 | |
| High Income Bond Fund II Quarter 3 Holdings November 26 2025 | Third quarter holdings based on fund's fiscal year end. | November 26 2025 | |
| High Yield Strategy Portfolio Quarter 3 Holdings November 26 2025 | Third quarter holdings based on fund's fiscal year end. | November 26 2025 | |
| Inflation Protected Securities Fund Prospectus November 26 2025 | The fund's Prospectus contains information including the fund's investment objective and strategies, principal investments, risks of investing in the fund, and sales charges, management fees and other expenses. | November 26 2025 | |
| Inflation Protected Securities Fund Statement of Additional Information November 26 2025 | The Statement of Additional Information offers detailed information about the fund's policies, operations, management, investments and risks. | November 26 2025 | |
| Inflation Protected Securities Fund Summary Prospectus November 26 2025 | The fund's Summary Prospectus contains information including the fund's investment objective and strategies, principal investments, risks of investing in the fund, and sales charges, management fees and other expenses. | November 26 2025 | |
| Kaufmann Fund II Quarter 3 Holdings November 26 2025 | Third quarter holdings based on fund's fiscal year end. | November 26 2025 | |
| MDT Market Neutral Fund Quarter 3 Holdings November 26 2025 | Third quarter holdings based on fund's fiscal year end. | November 26 2025 | |
| MDT Small Cap Value Fund Prospectus November 26 2025 | The fund's Prospectus contains information including the fund's investment objective and strategies, principal investments, risks of investing in the fund, and sales charges, management fees and other expenses. | November 26 2025 | |
| MDT Small Cap Value Fund Statement of Additional Information November 26 2025 | The Statement of Additional Information offers detailed information about the fund's policies, operations, management, investments and risks. | November 26 2025 | |
| MDT Small Cap Value Fund Summary Prospectus November 26 2025 | The fund's Summary Prospectus contains information including the fund's investment objective and strategies, principal investments, risks of investing in the fund, and sales charges, management fees and other expenses. | November 26 2025 | |
| Managed Volatility Fund II Quarter 3 Holdings November 26 2025 | Third quarter holdings based on fund's fiscal year end. | November 26 2025 | |
| Mortgage Strategy Portfolio Quarter 3 Holdings November 26 2025 | Third quarter holdings based on fund's fiscal year end. | November 26 2025 | |
| Muni and Stock Advantage Fund Prospectus November 26 2025 | The fund's Prospectus contains information including the fund's investment objective and strategies, principal investments, risks of investing in the fund, and sales charges, management fees and other expenses. | November 26 2025 | |
| Muni and Stock Advantage Fund Statement of Additional Information November 26 2025 | The Statement of Additional Information offers detailed information about the fund's policies, operations, management, investments and risks. | November 26 2025 | |
| Municipal Ultrashort Fund Prospectus November 26 2025 | The fund's Prospectus contains information including the fund's investment objective and strategies, principal investments, risks of investing in the fund, and sales charges, management fees and other expenses. | November 26 2025 | |
| Municipal Ultrashort Fund Statement of Additional Information November 26 2025 | The Statement of Additional Information offers detailed information about the fund's policies, operations, management, investments and risks. | November 26 2025 | |
| Municipal Ultrashort Fund Summary Prospectus November 26 2025 | The fund's Summary Prospectus contains information including the fund's investment objective and strategies, principal investments, risks of investing in the fund, and sales charges, management fees and other expenses. | November 26 2025 | |
| Project and Trade Finance Tender Fund Prospectus November 26 2025 | The fund's Prospectus contains information including the fund's investment objective and strategies, principal investments, risks of investing in the fund, and sales charges, management fees and other expenses. | November 26 2025 | |
| Project and Trade Finance Tender Fund Semi-Annual Shareholder Report November 26 2025 | The fund's semi-annual report provides shareholders with information such as recent performance, portfolio information and financial information. | November 26 2025 | |
| Project and Trade Finance Tender Fund Statement of Additional Information November 26 2025 | The Statement of Additional Information offers detailed information about the fund's policies, operations, management, investments and risks. | November 26 2025 | |
| Prudent Bear Fund Prospectus November 26 2025 | The fund's Prospectus contains information including the fund's investment objective and strategies, principal investments, risks of investing in the fund, and sales charges, management fees and other expenses. | November 26 2025 | |
| Prudent Bear Fund Statement of Additional Information November 26 2025 | The Statement of Additional Information offers detailed information about the fund's policies, operations, management, investments and risks. | November 26 2025 | |
| Prudent Bear Fund Summary Prospectus November 26 2025 | The fund's Summary Prospectus contains information including the fund's investment objective and strategies, principal investments, risks of investing in the fund, and sales charges, management fees and other expenses. | November 26 2025 | |
| Quality Bond Fund II Quarter 3 Holdings November 26 2025 | Third quarter holdings based on fund's fiscal year end. | November 26 2025 | |
| SDG (Sustainable Development Goals) Engagement Equity Fund Summary Prospectus November 26 2025 | The fund's Summary Prospectus contains information including the fund's investment objective and strategies, principal investments, risks of investing in the fund, and sales charges, management fees and other expenses. | November 26 2025 | |
| Short-Intermediate Municipal Fund Quarter 1 Holdings November 26 2025 | First quarter holdings based on fund's fiscal year end. | November 26 2025 | |
| Total Return Bond ETF (Exchange-Traded Fund) Quarter 3 Holdings November 26 2025 | Third quarter holdings based on fund's fiscal year end. | November 26 2025 | |
| U.S. (United States) SMID (Small-Mid Capitalization) Fund Quarter 1 Holdings November 26 2025 | First quarter holdings based on fund's fiscal year end. | November 26 2025 | |
| Ultrashort Bond Fund Prospectus November 26 2025 | The fund's Prospectus contains information including the fund's investment objective and strategies, principal investments, risks of investing in the fund, and sales charges, management fees and other expenses. | November 26 2025 | |
| Ultrashort Bond Fund Statement of Additional Information November 26 2025 | The Statement of Additional Information offers detailed information about the fund's policies, operations, management, investments and risks. | November 26 2025 | |
| Ultrashort Bond Fund Summary Prospectus November 26 2025 | The fund's Summary Prospectus contains information including the fund's investment objective and strategies, principal investments, risks of investing in the fund, and sales charges, management fees and other expenses. | November 26 2025 | |
| Core Bond Fund Annual Financial Statements November 25 2025 | This document is for a Fund that is no longer available for purchase. | November 25 2025 | |
| Ultrashort Bond Fund Annual Financial Statements November 25 2025 | The fund's annual financial statements provide shareholders with information such as recent performance, portfolio information and financial information. | November 25 2025 | |
| Core Bond Fund Annual Shareholder Report November 25 2025 | This document is for a Fund that is no longer available for purchase. | November 25 2025 | |
| Core Bond Fund Annual Shareholder Report November 25 2025 | This document is for a Fund that is no longer available for purchase. | November 25 2025 | |
| Ultrashort Bond Fund Annual Shareholder Report November 25 2025 | The fund’s annual report highlights key fund information, including expenses, performance, statistics, holdings, and material changes, if applicable. | November 25 2025 | |
| Ultrashort Bond Fund Annual Shareholder Report November 25 2025 | The fund’s annual report highlights key fund information, including expenses, performance, statistics, holdings, and material changes, if applicable. | November 25 2025 | |
| Ultrashort Bond Fund Annual Shareholder Report November 25 2025 | The fund’s annual report highlights key fund information, including expenses, performance, statistics, holdings, and material changes, if applicable. | November 25 2025 | |
| Ultrashort Bond Fund Annual Shareholder Report November 25 2025 | The fund’s annual report highlights key fund information, including expenses, performance, statistics, holdings, and material changes, if applicable. | November 25 2025 | |
| Sustainable High Yield Bond Fund, Inc. (Incorporated) Semi-Annual Financial Statements November 24 2025 | The fund's semi-annual financial statements provide shareholders with information such as recent performance, portfolio information and financial information. | November 24 2025 | |
| Sustainable High Yield Bond Fund, Inc. (Incorporated) Semi-Annual Shareholder Report November 24 2025 | The fund’s semi-annual report highlights key fund information, including expenses, statistics and holdings. | November 24 2025 | |
| Sustainable High Yield Bond Fund, Inc. (Incorporated) Semi-Annual Shareholder Report November 24 2025 | The fund’s semi-annual report highlights key fund information, including expenses, statistics and holdings. | November 24 2025 | |
| Sustainable High Yield Bond Fund, Inc. (Incorporated) Semi-Annual Shareholder Report November 24 2025 | The fund’s semi-annual report highlights key fund information, including expenses, statistics and holdings. | November 24 2025 | |
| Sustainable High Yield Bond Fund, Inc. (Incorporated) Semi-Annual Shareholder Report November 24 2025 | The fund’s semi-annual report highlights key fund information, including expenses, statistics and holdings. | November 24 2025 | |
| Project and Trade Finance Core Fund Semi-Annual Financial Statements November 24 2025 | The fund's semi-annual financial statements provide shareholders with information such as recent performance, portfolio information and financial information. | November 24 2025 | |
| Fund for U.S. (United States) Government Securities Semi-Annual Financial Statements November 24 2025 | The fund's semi-annual financial statements provide shareholders with information such as recent performance, portfolio information and financial information. | November 24 2025 | |
| Fund for U.S. (United States) Government Securities Semi-Annual Shareholder Report November 24 2025 | The fund’s semi-annual report highlights key fund information, including expenses, statistics and holdings. | November 24 2025 | |
| Fund for U.S. (United States) Government Securities Semi-Annual Shareholder Report November 24 2025 | The fund’s semi-annual report highlights key fund information, including expenses, statistics and holdings. | November 24 2025 | |
| Fund for U.S. (United States) Government Securities Semi-Annual Shareholder Report November 24 2025 | The fund’s semi-annual report highlights key fund information, including expenses, statistics and holdings. | November 24 2025 | |
| Municipal Bond Fund, Inc. (Incorporated) Semi-Annual Financial Statements November 24 2025 | The fund's semi-annual financial statements provide shareholders with information such as recent performance, portfolio information and financial information. | November 24 2025 | |
| Municipal Bond Fund, Inc. (Incorporated) Semi-Annual Shareholder Report November 24 2025 | The fund’s semi-annual report highlights key fund information, including expenses, statistics and holdings. | November 24 2025 | |
| Municipal Bond Fund, Inc. (Incorporated) Semi-Annual Shareholder Report November 24 2025 | The fund’s semi-annual report highlights key fund information, including expenses, statistics and holdings. | November 24 2025 | |
| Municipal Bond Fund, Inc. (Incorporated) Semi-Annual Shareholder Report November 24 2025 | The fund’s semi-annual report highlights key fund information, including expenses, statistics and holdings. | November 24 2025 | |
| Municipal Bond Fund, Inc. (Incorporated) Semi-Annual Shareholder Report November 24 2025 | The fund’s semi-annual report highlights key fund information, including expenses, statistics and holdings. | November 24 2025 | |
| Prudent Bear Fund Annual Financial Statements November 24 2025 | The fund's annual financial statements provide shareholders with information such as recent performance, portfolio information and financial information. | November 24 2025 | |
| Prudent Bear Fund Annual Shareholder Report November 24 2025 | The fund’s annual report highlights key fund information, including expenses, performance, statistics, holdings, and material changes, if applicable. | November 24 2025 | |
| Prudent Bear Fund Annual Shareholder Report November 24 2025 | The fund’s annual report highlights key fund information, including expenses, performance, statistics, holdings, and material changes, if applicable. | November 24 2025 | |
| Prudent Bear Fund Annual Shareholder Report November 24 2025 | The fund’s annual report highlights key fund information, including expenses, performance, statistics, holdings, and material changes, if applicable. | November 24 2025 | |
| Floating Rate Strategic Income Fund Semi-Annual Financial Statements November 24 2025 | The fund's semi-annual financial statements provide shareholders with information such as recent performance, portfolio information and financial information. | November 24 2025 | |
| Inflation Protected Securities Fund Annual Financial Statements November 24 2025 | The fund's annual financial statements provide shareholders with information such as recent performance, portfolio information and financial information. | November 24 2025 | |
| Clover Small Value Fund Annual Financial Statements November 24 2025 | The fund's annual financial statements provide shareholders with information such as recent performance, portfolio information and financial information. | November 24 2025 | |
| Clover Small Value Fund Annual Shareholder Report November 24 2025 | The fund’s annual report highlights key fund information, including expenses, performance, statistics, holdings, and material changes, if applicable. | November 24 2025 | |
| Clover Small Value Fund Annual Shareholder Report November 24 2025 | The fund’s annual report highlights key fund information, including expenses, performance, statistics, holdings, and material changes, if applicable. | November 24 2025 | |
| Clover Small Value Fund Annual Shareholder Report November 24 2025 | The fund’s annual report highlights key fund information, including expenses, performance, statistics, holdings, and material changes, if applicable. | November 24 2025 | |
| Clover Small Value Fund Annual Shareholder Report November 24 2025 | The fund’s annual report highlights key fund information, including expenses, performance, statistics, holdings, and material changes, if applicable. | November 24 2025 | |
| Clover Small Value Fund Annual Shareholder Report November 24 2025 | The fund’s annual report highlights key fund information, including expenses, performance, statistics, holdings, and material changes, if applicable. | November 24 2025 | |
| Floating Rate Strategic Income Fund Semi-Annual Shareholder Report November 24 2025 | The fund’s semi-annual report highlights key fund information, including expenses, statistics and holdings. | November 24 2025 | |
| Floating Rate Strategic Income Fund Semi-Annual Shareholder Report November 24 2025 | The fund’s semi-annual report highlights key fund information, including expenses, statistics and holdings. | November 24 2025 | |
| Floating Rate Strategic Income Fund Semi-Annual Shareholder Report November 24 2025 | The fund’s semi-annual report highlights key fund information, including expenses, statistics and holdings. | November 24 2025 | |
| Inflation Protected Securities Fund Annual Shareholder Report November 24 2025 | The fund’s annual report highlights key fund information, including expenses, performance, statistics, holdings, and material changes, if applicable. | November 24 2025 | |
| Inflation Protected Securities Fund Annual Shareholder Report November 24 2025 | The fund’s annual report highlights key fund information, including expenses, performance, statistics, holdings, and material changes, if applicable. | November 24 2025 | |
| Inflation Protected Securities Fund Annual Shareholder Report November 24 2025 | The fund’s annual report highlights key fund information, including expenses, performance, statistics, holdings, and material changes, if applicable. | November 24 2025 | |
| Inflation Protected Securities Fund Annual Shareholder Report November 24 2025 | The fund’s annual report highlights key fund information, including expenses, performance, statistics, holdings, and material changes, if applicable. | November 24 2025 | |
| Municipal Ultrashort Fund Annual Financial Statements November 24 2025 | The fund's annual financial statements provide shareholders with information such as recent performance, portfolio information and financial information. | November 24 2025 | |
| Municipal Ultrashort Fund Annual Shareholder Report November 24 2025 | The fund’s annual report highlights key fund information, including expenses, performance, statistics, holdings, and material changes, if applicable. | November 24 2025 | |
| Municipal Ultrashort Fund Annual Shareholder Report November 24 2025 | The fund’s annual report highlights key fund information, including expenses, performance, statistics, holdings, and material changes, if applicable. | November 24 2025 | |
| Municipal Ultrashort Fund Annual Shareholder Report November 24 2025 | The fund’s annual report highlights key fund information, including expenses, performance, statistics, holdings, and material changes, if applicable. | November 24 2025 | |
| Max-Cap Index Fund Prospectus November 18 2025 | The fund's Prospectus contains information including the fund's investment objective and strategies, principal investments, risks of investing in the fund, and sales charges, management fees and other expenses. | November 18 2025 | |
| Max-Cap Index Fund Statement of Additional Information November 18 2025 | The Statement of Additional Information offers detailed information about the fund's policies, operations, management, investments and risks. | November 18 2025 | |
| Max-Cap Index Fund Summary Prospectus November 18 2025 | The fund's Summary Prospectus contains information including the fund's investment objective and strategies, principal investments, risks of investing in the fund, and sales charges, management fees and other expenses. | November 18 2025 | |
| Core Bond Fund Prospectus November 14 2025 | This document is for a Fund that is no longer available for purchase. | November 14 2025 | |
| Core Bond Fund Quarter 1 Holdings November 14 2025 | This document is for a Fund that is no longer available for purchase. | November 14 2025 | |
| Core Bond Fund Quarter 3 Holdings November 14 2025 | This document is for a Fund that is no longer available for purchase. | November 14 2025 | |
| Core Bond Fund Semi-Annual Financial Statements November 14 2025 | This document is for a Fund that is no longer available for purchase. | November 14 2025 | |
| Core Bond Fund Semi-Annual Shareholder Report November 14 2025 | This document is for a Fund that is no longer available for purchase. | November 14 2025 | |
| Core Bond Fund Semi-Annual Shareholder Report November 14 2025 | This document is for a Fund that is no longer available for purchase. | November 14 2025 | |
| Core Bond Fund Statement of Additional Information November 14 2025 | This document is for a Fund that is no longer available for purchase. | November 14 2025 | |
| Core Bond Fund Summary Prospectus November 14 2025 | This document is for a Fund that is no longer available for purchase. | November 14 2025 | |
| Short-Intermediate Government Fund Summary Prospectus November 6 2025 | The fund's Summary Prospectus contains information including the fund's investment objective and strategies, principal investments, risks of investing in the fund, and sales charges, management fees and other expenses. | November 6 2025 | |
| Managed Volatility Fund II Statement of Additional Information November 6 2025 | The Statement of Additional Information offers detailed information about the fund's policies, operations, management, investments and risks. | November 6 2025 | |
| Short-Intermediate Government Fund Statement of Additional Information November 6 2025 | The Statement of Additional Information offers detailed information about the fund's policies, operations, management, investments and risks. | November 6 2025 | |
| Managed Volatility Fund II Prospectus November 6 2025 | The fund's Prospectus contains information including the fund's investment objective and strategies, principal investments, risks of investing in the fund, and sales charges, management fees and other expenses. | November 6 2025 | |
| Managed Volatility Fund II Prospectus November 6 2025 | The fund's Prospectus contains information including the fund's investment objective and strategies, principal investments, risks of investing in the fund, and sales charges, management fees and other expenses. | November 6 2025 | |