v3.25.1
Shareholder Report, Holdings (Details)
Mar. 31, 2025
C000085566 | Fox Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 5.00%
C000085566 | Vulcan Materials Co.  
Holdings [Line Items]  
Percent of Net Asset Value 4.20%
C000085566 | Intra-Cellular Therapies Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 3.80%
C000085566 | United States Cellular Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 3.20%
C000085566 | Myers Industries Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.70%
C000085566 | Atlanta Braves Holdings Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.70%
C000085566 | SurModics Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.10%
C000085566 | TEGNA Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.10%
C000085566 | Millicom International Cellular SA  
Holdings [Line Items]  
Percent of Net Asset Value 2.00%
C000085566 | TXNM Energy Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.00%
C000085566 | InvestmentType_Common Stocks  
Holdings [Line Items]  
Percent of Net Asset Value 97.90%
C000085566 | InvestmentType_U.S. Government Obligations  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
C000085566 | InvestmentType_Rights  
Holdings [Line Items]  
Percent of Net Asset Value 0.60%
C000085566 | InvestmentType_Closed-End Funds  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
C000085566 | InvestmentType_Other Assets and Liabilities (Net)  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
C000085566 | Energy and Utilities  
Holdings [Line Items]  
Percent of Net Asset Value 17.00%
C000085566 | Health Care  
Holdings [Line Items]  
Percent of Net Asset Value 12.00%
C000085566 | Entertainment  
Holdings [Line Items]  
Percent of Net Asset Value 10.00%
C000085566 | Telecommunications  
Holdings [Line Items]  
Percent of Net Asset Value 8.50%
C000085566 | Building and Construction - Long  
Holdings [Line Items]  
Percent of Net Asset Value 6.40%
C000085566 | Financial Services  
Holdings [Line Items]  
Percent of Net Asset Value 6.30%
C000085566 | Wireless Communications  
Holdings [Line Items]  
Percent of Net Asset Value 6.20%
C000085566 | Diversified Industrial  
Holdings [Line Items]  
Percent of Net Asset Value 5.80%
C000085566 | Other Industry sectors  
Holdings [Line Items]  
Percent of Net Asset Value 27.40%
C000085566 | Other Assets and Liabilities (Net)  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
C000049132 | Fox Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 5.00%
C000049132 | Vulcan Materials Co.  
Holdings [Line Items]  
Percent of Net Asset Value 4.20%
C000049132 | Intra-Cellular Therapies Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 3.80%
C000049132 | United States Cellular Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 3.20%
C000049132 | Myers Industries Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.70%
C000049132 | Atlanta Braves Holdings Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.70%
C000049132 | SurModics Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.10%
C000049132 | TEGNA Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.10%
C000049132 | Millicom International Cellular SA  
Holdings [Line Items]  
Percent of Net Asset Value 2.00%
C000049132 | TXNM Energy Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.00%
C000049132 | InvestmentType_Common Stocks  
Holdings [Line Items]  
Percent of Net Asset Value 97.90%
C000049132 | InvestmentType_U.S. Government Obligations  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
C000049132 | InvestmentType_Rights  
Holdings [Line Items]  
Percent of Net Asset Value 0.60%
C000049132 | InvestmentType_Closed-End Funds  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
C000049132 | InvestmentType_Other Assets and Liabilities (Net)  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
C000049132 | Energy and Utilities  
Holdings [Line Items]  
Percent of Net Asset Value 17.00%
C000049132 | Health Care  
Holdings [Line Items]  
Percent of Net Asset Value 12.00%
C000049132 | Entertainment  
Holdings [Line Items]  
Percent of Net Asset Value 10.00%
C000049132 | Telecommunications  
Holdings [Line Items]  
Percent of Net Asset Value 8.50%
C000049132 | Building and Construction - Long  
Holdings [Line Items]  
Percent of Net Asset Value 6.40%
C000049132 | Financial Services  
Holdings [Line Items]  
Percent of Net Asset Value 6.30%
C000049132 | Wireless Communications  
Holdings [Line Items]  
Percent of Net Asset Value 6.20%
C000049132 | Diversified Industrial  
Holdings [Line Items]  
Percent of Net Asset Value 5.80%
C000049132 | Other Industry sectors  
Holdings [Line Items]  
Percent of Net Asset Value 27.40%
C000049132 | Other Assets and Liabilities (Net)  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
C000049133 | Fox Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 5.00%
C000049133 | Vulcan Materials Co.  
Holdings [Line Items]  
Percent of Net Asset Value 4.20%
C000049133 | Intra-Cellular Therapies Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 3.80%
C000049133 | United States Cellular Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 3.20%
C000049133 | Myers Industries Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.70%
C000049133 | Atlanta Braves Holdings Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.70%
C000049133 | SurModics Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.10%
C000049133 | TEGNA Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.10%
C000049133 | Millicom International Cellular SA  
Holdings [Line Items]  
Percent of Net Asset Value 2.00%
C000049133 | TXNM Energy Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.00%
C000049133 | InvestmentType_Common Stocks  
Holdings [Line Items]  
Percent of Net Asset Value 97.90%
C000049133 | InvestmentType_U.S. Government Obligations  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
C000049133 | InvestmentType_Rights  
Holdings [Line Items]  
Percent of Net Asset Value 0.60%
C000049133 | InvestmentType_Closed-End Funds  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
C000049133 | InvestmentType_Other Assets and Liabilities (Net)  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
C000049133 | Energy and Utilities  
Holdings [Line Items]  
Percent of Net Asset Value 17.00%
C000049133 | Health Care  
Holdings [Line Items]  
Percent of Net Asset Value 12.00%
C000049133 | Entertainment  
Holdings [Line Items]  
Percent of Net Asset Value 10.00%
C000049133 | Telecommunications  
Holdings [Line Items]  
Percent of Net Asset Value 8.50%
C000049133 | Building and Construction - Long  
Holdings [Line Items]  
Percent of Net Asset Value 6.40%
C000049133 | Financial Services  
Holdings [Line Items]  
Percent of Net Asset Value 6.30%
C000049133 | Wireless Communications  
Holdings [Line Items]  
Percent of Net Asset Value 6.20%
C000049133 | Diversified Industrial  
Holdings [Line Items]  
Percent of Net Asset Value 5.80%
C000049133 | Other Industry sectors  
Holdings [Line Items]  
Percent of Net Asset Value 27.40%
C000049133 | Other Assets and Liabilities (Net)  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
C000049130 | Fox Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 5.00%
C000049130 | Vulcan Materials Co.  
Holdings [Line Items]  
Percent of Net Asset Value 4.20%
C000049130 | Intra-Cellular Therapies Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 3.80%
C000049130 | United States Cellular Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 3.20%
C000049130 | Myers Industries Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.70%
C000049130 | Atlanta Braves Holdings Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.70%
C000049130 | SurModics Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.10%
C000049130 | TEGNA Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.10%
C000049130 | Millicom International Cellular SA  
Holdings [Line Items]  
Percent of Net Asset Value 2.00%
C000049130 | TXNM Energy Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.00%
C000049130 | InvestmentType_Common Stocks  
Holdings [Line Items]  
Percent of Net Asset Value 97.90%
C000049130 | InvestmentType_U.S. Government Obligations  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
C000049130 | InvestmentType_Rights  
Holdings [Line Items]  
Percent of Net Asset Value 0.60%
C000049130 | InvestmentType_Closed-End Funds  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
C000049130 | InvestmentType_Other Assets and Liabilities (Net)  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
C000049130 | Energy and Utilities  
Holdings [Line Items]  
Percent of Net Asset Value 17.00%
C000049130 | Health Care  
Holdings [Line Items]  
Percent of Net Asset Value 12.00%
C000049130 | Entertainment  
Holdings [Line Items]  
Percent of Net Asset Value 10.00%
C000049130 | Telecommunications  
Holdings [Line Items]  
Percent of Net Asset Value 8.50%
C000049130 | Building and Construction - Long  
Holdings [Line Items]  
Percent of Net Asset Value 6.40%
C000049130 | Financial Services  
Holdings [Line Items]  
Percent of Net Asset Value 6.30%
C000049130 | Wireless Communications  
Holdings [Line Items]  
Percent of Net Asset Value 6.20%
C000049130 | Diversified Industrial  
Holdings [Line Items]  
Percent of Net Asset Value 5.80%
C000049130 | Other Industry sectors  
Holdings [Line Items]  
Percent of Net Asset Value 27.40%
C000049130 | Other Assets and Liabilities (Net)  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%