v3.26.1
Shareholder Report, Holdings (Details)
Mar. 31, 2026
C000002934 | NetScout Systems Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 3.30%
C000002934 | Advanced Energy Industries Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.60%
C000002934 | Flowserve Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 2.60%
C000002934 | AAR Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 2.60%
C000002934 | MKS Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
C000002934 | OPENLANE Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
C000002934 | TTM Technologies Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.30%
C000002934 | MYR Group Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.20%
C000002934 | IMAX Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 2.20%
C000002934 | Ultra Clean Holdings Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.20%
C000002934 | InvestmentType_Common Stocks  
Holdings [Line Items]  
Percent of Net Asset Value 94.50%
C000002934 | InvestmentType_U.S. Government Obligations  
Holdings [Line Items]  
Percent of Net Asset Value 5.10%
C000002934 | Banking  
Holdings [Line Items]  
Percent of Net Asset Value 12.10%
C000002934 | Semiconductors  
Holdings [Line Items]  
Percent of Net Asset Value 11.00%
C000002934 | Diversified Industrial  
Holdings [Line Items]  
Percent of Net Asset Value 7.10%
C000002934 | Health Care  
Holdings [Line Items]  
Percent of Net Asset Value 7.00%
C000002934 | Computer Software and Services  
Holdings [Line Items]  
Percent of Net Asset Value 5.70%
C000002934 | Energy and Utilities  
Holdings [Line Items]  
Percent of Net Asset Value 5.50%
C000002934 | Electronics  
Holdings [Line Items]  
Percent of Net Asset Value 5.40%
C000002934 | Retail  
Holdings [Line Items]  
Percent of Net Asset Value 5.30%
C000002934 | Other Industry sectors  
Holdings [Line Items]  
Percent of Net Asset Value 40.50%
C000002933 | NetScout Systems Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 3.30%
C000002933 | Advanced Energy Industries Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.60%
C000002933 | Flowserve Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 2.60%
C000002933 | AAR Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 2.60%
C000002933 | MKS Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
C000002933 | OPENLANE Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
C000002933 | TTM Technologies Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.30%
C000002933 | MYR Group Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.20%
C000002933 | IMAX Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 2.20%
C000002933 | Ultra Clean Holdings Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.20%
C000002933 | InvestmentType_Common Stocks  
Holdings [Line Items]  
Percent of Net Asset Value 94.50%
C000002933 | InvestmentType_U.S. Government Obligations  
Holdings [Line Items]  
Percent of Net Asset Value 5.10%
C000002933 | Banking  
Holdings [Line Items]  
Percent of Net Asset Value 12.10%
C000002933 | Semiconductors  
Holdings [Line Items]  
Percent of Net Asset Value 11.00%
C000002933 | Diversified Industrial  
Holdings [Line Items]  
Percent of Net Asset Value 7.10%
C000002933 | Health Care  
Holdings [Line Items]  
Percent of Net Asset Value 7.00%
C000002933 | Computer Software and Services  
Holdings [Line Items]  
Percent of Net Asset Value 5.70%
C000002933 | Energy and Utilities  
Holdings [Line Items]  
Percent of Net Asset Value 5.50%
C000002933 | Electronics  
Holdings [Line Items]  
Percent of Net Asset Value 5.40%
C000002933 | Retail  
Holdings [Line Items]  
Percent of Net Asset Value 5.30%
C000002933 | Other Industry sectors  
Holdings [Line Items]  
Percent of Net Asset Value 40.50%
C000061068 | NetScout Systems Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 3.30%
C000061068 | Advanced Energy Industries Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.60%
C000061068 | Flowserve Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 2.60%
C000061068 | AAR Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 2.60%
C000061068 | MKS Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
C000061068 | OPENLANE Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
C000061068 | TTM Technologies Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.30%
C000061068 | MYR Group Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.20%
C000061068 | IMAX Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 2.20%
C000061068 | Ultra Clean Holdings Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.20%
C000061068 | InvestmentType_Common Stocks  
Holdings [Line Items]  
Percent of Net Asset Value 94.50%
C000061068 | InvestmentType_U.S. Government Obligations  
Holdings [Line Items]  
Percent of Net Asset Value 5.10%
C000061068 | Banking  
Holdings [Line Items]  
Percent of Net Asset Value 12.10%
C000061068 | Semiconductors  
Holdings [Line Items]  
Percent of Net Asset Value 11.00%
C000061068 | Diversified Industrial  
Holdings [Line Items]  
Percent of Net Asset Value 7.10%
C000061068 | Health Care  
Holdings [Line Items]  
Percent of Net Asset Value 7.00%
C000061068 | Computer Software and Services  
Holdings [Line Items]  
Percent of Net Asset Value 5.70%
C000061068 | Energy and Utilities  
Holdings [Line Items]  
Percent of Net Asset Value 5.50%
C000061068 | Electronics  
Holdings [Line Items]  
Percent of Net Asset Value 5.40%
C000061068 | Retail  
Holdings [Line Items]  
Percent of Net Asset Value 5.30%
C000061068 | Other Industry sectors  
Holdings [Line Items]  
Percent of Net Asset Value 40.50%
C000002931 | NetScout Systems Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 3.30%
C000002931 | Advanced Energy Industries Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.60%
C000002931 | Flowserve Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 2.60%
C000002931 | AAR Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 2.60%
C000002931 | MKS Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
C000002931 | OPENLANE Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
C000002931 | TTM Technologies Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.30%
C000002931 | MYR Group Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.20%
C000002931 | IMAX Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 2.20%
C000002931 | Ultra Clean Holdings Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.20%
C000002931 | InvestmentType_Common Stocks  
Holdings [Line Items]  
Percent of Net Asset Value 94.50%
C000002931 | InvestmentType_U.S. Government Obligations  
Holdings [Line Items]  
Percent of Net Asset Value 5.10%
C000002931 | Banking  
Holdings [Line Items]  
Percent of Net Asset Value 12.10%
C000002931 | Semiconductors  
Holdings [Line Items]  
Percent of Net Asset Value 11.00%
C000002931 | Diversified Industrial  
Holdings [Line Items]  
Percent of Net Asset Value 7.10%
C000002931 | Health Care  
Holdings [Line Items]  
Percent of Net Asset Value 7.00%
C000002931 | Computer Software and Services  
Holdings [Line Items]  
Percent of Net Asset Value 5.70%
C000002931 | Energy and Utilities  
Holdings [Line Items]  
Percent of Net Asset Value 5.50%
C000002931 | Electronics  
Holdings [Line Items]  
Percent of Net Asset Value 5.40%
C000002931 | Retail  
Holdings [Line Items]  
Percent of Net Asset Value 5.30%
C000002931 | Other Industry sectors  
Holdings [Line Items]  
Percent of Net Asset Value 40.50%
C000002912 | U.S. Treasury Bonds  
Holdings [Line Items]  
Percent of Net Asset Value 3.90%
C000002912 | Amazon.com Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
C000002912 | NVIDIA Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 3.50%
C000002912 | U.S. Treasury Notes  
Holdings [Line Items]  
Percent of Net Asset Value 3.30%
C000002912 | Broadcom Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.00%
C000002912 | NextEra Energy Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 1.60%
C000002912 | Deere & Co.  
Holdings [Line Items]  
Percent of Net Asset Value 1.60%
C000002912 | CSX Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
C000002912 | Johnson & Johnson  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
C000002912 | Thermo Fisher Scientific Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
C000002912 | InvestmentType_Common Stocks  
Holdings [Line Items]  
Percent of Net Asset Value 61.80%
C000002912 | InvestmentType_U.S. Government Obligations  
Holdings [Line Items]  
Percent of Net Asset Value 7.10%
C000002912 | InvestmentType_Corporate Bonds  
Holdings [Line Items]  
Percent of Net Asset Value 24.40%
C000002912 | InvestmentType_Convertible Corporate Bonds  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
C000002912 | InvestmentType_Mandatory Convertible Securities  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
C000002912 | InvestmentType_Foreign Government Obligations  
Holdings [Line Items]  
Percent of Net Asset Value 0.90%
C000002912 | InvestmentType_Short Term Investment  
Holdings [Line Items]  
Percent of Net Asset Value 0.20%
C000002912 | Semiconductors  
Holdings [Line Items]  
Percent of Net Asset Value 8.10%
C000002912 | Diversified Industrial  
Holdings [Line Items]  
Percent of Net Asset Value 6.60%
C000002912 | Health Care  
Holdings [Line Items]  
Percent of Net Asset Value 7.10%
C000002912 | Computer Software and Services  
Holdings [Line Items]  
Percent of Net Asset Value 5.40%
C000002912 | Other Industry sectors  
Holdings [Line Items]  
Percent of Net Asset Value 38.50%
C000002912 | Financial Services  
Holdings [Line Items]  
Percent of Net Asset Value 17.00%
C000002912 | U.S. Government Obligations  
Holdings [Line Items]  
Percent of Net Asset Value 7.10%
C000002912 | Energy: Oil  
Holdings [Line Items]  
Percent of Net Asset Value 5.80%
C000002912 | Food and Beverage  
Holdings [Line Items]  
Percent of Net Asset Value 3.80%
C000002912 | Other Assets and Liabilities (Net)  
Holdings [Line Items]  
Percent of Net Asset Value 0.60%
C000002914 | U.S. Treasury Bonds  
Holdings [Line Items]  
Percent of Net Asset Value 3.90%
C000002914 | Amazon.com Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
C000002914 | NVIDIA Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 3.50%
C000002914 | U.S. Treasury Notes  
Holdings [Line Items]  
Percent of Net Asset Value 3.30%
C000002914 | Broadcom Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.00%
C000002914 | NextEra Energy Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 1.60%
C000002914 | Deere & Co.  
Holdings [Line Items]  
Percent of Net Asset Value 1.60%
C000002914 | CSX Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
C000002914 | Johnson & Johnson  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
C000002914 | Thermo Fisher Scientific Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
C000002914 | InvestmentType_Common Stocks  
Holdings [Line Items]  
Percent of Net Asset Value 61.80%
C000002914 | InvestmentType_U.S. Government Obligations  
Holdings [Line Items]  
Percent of Net Asset Value 7.10%
C000002914 | InvestmentType_Corporate Bonds  
Holdings [Line Items]  
Percent of Net Asset Value 24.40%
C000002914 | InvestmentType_Convertible Corporate Bonds  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
C000002914 | InvestmentType_Mandatory Convertible Securities  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
C000002914 | InvestmentType_Foreign Government Obligations  
Holdings [Line Items]  
Percent of Net Asset Value 0.90%
C000002914 | InvestmentType_Short Term Investment  
Holdings [Line Items]  
Percent of Net Asset Value 0.20%
C000002914 | Semiconductors  
Holdings [Line Items]  
Percent of Net Asset Value 8.10%
C000002914 | Diversified Industrial  
Holdings [Line Items]  
Percent of Net Asset Value 6.60%
C000002914 | Health Care  
Holdings [Line Items]  
Percent of Net Asset Value 7.10%
C000002914 | Computer Software and Services  
Holdings [Line Items]  
Percent of Net Asset Value 5.40%
C000002914 | Other Industry sectors  
Holdings [Line Items]  
Percent of Net Asset Value 38.50%
C000002914 | Financial Services  
Holdings [Line Items]  
Percent of Net Asset Value 17.00%
C000002914 | U.S. Government Obligations  
Holdings [Line Items]  
Percent of Net Asset Value 7.10%
C000002914 | Energy: Oil  
Holdings [Line Items]  
Percent of Net Asset Value 5.80%
C000002914 | Food and Beverage  
Holdings [Line Items]  
Percent of Net Asset Value 3.80%
C000002914 | Other Assets and Liabilities (Net)  
Holdings [Line Items]  
Percent of Net Asset Value 0.60%
C000061063 | U.S. Treasury Bonds  
Holdings [Line Items]  
Percent of Net Asset Value 3.90%
C000061063 | Amazon.com Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
C000061063 | NVIDIA Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 3.50%
C000061063 | U.S. Treasury Notes  
Holdings [Line Items]  
Percent of Net Asset Value 3.30%
C000061063 | Broadcom Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.00%
C000061063 | NextEra Energy Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 1.60%
C000061063 | Deere & Co.  
Holdings [Line Items]  
Percent of Net Asset Value 1.60%
C000061063 | CSX Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
C000061063 | Johnson & Johnson  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
C000061063 | Thermo Fisher Scientific Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
C000061063 | InvestmentType_Common Stocks  
Holdings [Line Items]  
Percent of Net Asset Value 61.80%
C000061063 | InvestmentType_U.S. Government Obligations  
Holdings [Line Items]  
Percent of Net Asset Value 7.10%
C000061063 | InvestmentType_Corporate Bonds  
Holdings [Line Items]  
Percent of Net Asset Value 24.40%
C000061063 | InvestmentType_Convertible Corporate Bonds  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
C000061063 | InvestmentType_Mandatory Convertible Securities  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
C000061063 | InvestmentType_Foreign Government Obligations  
Holdings [Line Items]  
Percent of Net Asset Value 0.90%
C000061063 | InvestmentType_Short Term Investment  
Holdings [Line Items]  
Percent of Net Asset Value 0.20%
C000061063 | Semiconductors  
Holdings [Line Items]  
Percent of Net Asset Value 8.10%
C000061063 | Diversified Industrial  
Holdings [Line Items]  
Percent of Net Asset Value 6.60%
C000061063 | Health Care  
Holdings [Line Items]  
Percent of Net Asset Value 7.10%
C000061063 | Computer Software and Services  
Holdings [Line Items]  
Percent of Net Asset Value 5.40%
C000061063 | Other Industry sectors  
Holdings [Line Items]  
Percent of Net Asset Value 38.50%
C000061063 | Financial Services  
Holdings [Line Items]  
Percent of Net Asset Value 17.00%
C000061063 | U.S. Government Obligations  
Holdings [Line Items]  
Percent of Net Asset Value 7.10%
C000061063 | Energy: Oil  
Holdings [Line Items]  
Percent of Net Asset Value 5.80%
C000061063 | Food and Beverage  
Holdings [Line Items]  
Percent of Net Asset Value 3.80%
C000061063 | Other Assets and Liabilities (Net)  
Holdings [Line Items]  
Percent of Net Asset Value 0.60%
C000002911 | U.S. Treasury Bonds  
Holdings [Line Items]  
Percent of Net Asset Value 3.90%
C000002911 | Amazon.com Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
C000002911 | NVIDIA Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 3.50%
C000002911 | U.S. Treasury Notes  
Holdings [Line Items]  
Percent of Net Asset Value 3.30%
C000002911 | Broadcom Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.00%
C000002911 | NextEra Energy Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 1.60%
C000002911 | Deere & Co.  
Holdings [Line Items]  
Percent of Net Asset Value 1.60%
C000002911 | CSX Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
C000002911 | Johnson & Johnson  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
C000002911 | Thermo Fisher Scientific Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
C000002911 | InvestmentType_Common Stocks  
Holdings [Line Items]  
Percent of Net Asset Value 61.80%
C000002911 | InvestmentType_U.S. Government Obligations  
Holdings [Line Items]  
Percent of Net Asset Value 7.10%
C000002911 | InvestmentType_Corporate Bonds  
Holdings [Line Items]  
Percent of Net Asset Value 24.40%
C000002911 | InvestmentType_Convertible Corporate Bonds  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
C000002911 | InvestmentType_Mandatory Convertible Securities  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
C000002911 | InvestmentType_Foreign Government Obligations  
Holdings [Line Items]  
Percent of Net Asset Value 0.90%
C000002911 | InvestmentType_Short Term Investment  
Holdings [Line Items]  
Percent of Net Asset Value 0.20%
C000002911 | Semiconductors  
Holdings [Line Items]  
Percent of Net Asset Value 8.10%
C000002911 | Diversified Industrial  
Holdings [Line Items]  
Percent of Net Asset Value 6.60%
C000002911 | Health Care  
Holdings [Line Items]  
Percent of Net Asset Value 7.10%
C000002911 | Computer Software and Services  
Holdings [Line Items]  
Percent of Net Asset Value 5.40%
C000002911 | Other Industry sectors  
Holdings [Line Items]  
Percent of Net Asset Value 38.50%
C000002911 | Financial Services  
Holdings [Line Items]  
Percent of Net Asset Value 17.00%
C000002911 | U.S. Government Obligations  
Holdings [Line Items]  
Percent of Net Asset Value 7.10%
C000002911 | Energy: Oil  
Holdings [Line Items]  
Percent of Net Asset Value 5.80%
C000002911 | Food and Beverage  
Holdings [Line Items]  
Percent of Net Asset Value 3.80%
C000002911 | Other Assets and Liabilities (Net)  
Holdings [Line Items]  
Percent of Net Asset Value 0.60%
C000002922 | PPL Capital Funding Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 4.10%
C000002922 | Bridgebio Pharma Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
C000002922 | Hewlett Packard Enterprise Co.  
Holdings [Line Items]  
Percent of Net Asset Value 2.80%
C000002922 | Digital Realty Trust LP  
Holdings [Line Items]  
Percent of Net Asset Value 2.80%
C000002922 | Microchip Technology Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
C000002922 | BrightSpring Health Services Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
C000002922 | Alibaba Group Holding Ltd.  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
C000002922 | Lumentum Holdings Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
C000002922 | Applied Digital Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 2.30%
C000002922 | OSI Systems Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.30%
C000002922 | InvestmentType_U.S. Government Obligations  
Holdings [Line Items]  
Percent of Net Asset Value 1.90%
C000002922 | InvestmentType_Convertible Corporate Bonds  
Holdings [Line Items]  
Percent of Net Asset Value 83.20%
C000002922 | InvestmentType_Mandatory Convertible Securities  
Holdings [Line Items]  
Percent of Net Asset Value 14.40%
C000002922 | Semiconductors  
Holdings [Line Items]  
Percent of Net Asset Value 4.60%
C000002922 | Health Care  
Holdings [Line Items]  
Percent of Net Asset Value 23.40%
C000002922 | Computer Software and Services  
Holdings [Line Items]  
Percent of Net Asset Value 10.30%
C000002922 | Other Industry sectors  
Holdings [Line Items]  
Percent of Net Asset Value 23.90%
C000002922 | Financial Services  
Holdings [Line Items]  
Percent of Net Asset Value 9.20%
C000002922 | Other Assets and Liabilities (Net)  
Holdings [Line Items]  
Percent of Net Asset Value 0.50%
C000002922 | Energy and Utilities: Services  
Holdings [Line Items]  
Percent of Net Asset Value 10.30%
C000002922 | Energy and Energy Services  
Holdings [Line Items]  
Percent of Net Asset Value 8.40%
C000002922 | Aerospace and Defense  
Holdings [Line Items]  
Percent of Net Asset Value 6.00%
C000002922 | Metals and Mining  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
C000002921 | PPL Capital Funding Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 4.10%
C000002921 | Bridgebio Pharma Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
C000002921 | Hewlett Packard Enterprise Co.  
Holdings [Line Items]  
Percent of Net Asset Value 2.80%
C000002921 | Digital Realty Trust LP  
Holdings [Line Items]  
Percent of Net Asset Value 2.80%
C000002921 | Microchip Technology Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
C000002921 | BrightSpring Health Services Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
C000002921 | Alibaba Group Holding Ltd.  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
C000002921 | Lumentum Holdings Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
C000002921 | Applied Digital Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 2.30%
C000002921 | OSI Systems Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.30%
C000002921 | InvestmentType_U.S. Government Obligations  
Holdings [Line Items]  
Percent of Net Asset Value 1.90%
C000002921 | InvestmentType_Convertible Corporate Bonds  
Holdings [Line Items]  
Percent of Net Asset Value 83.20%
C000002921 | InvestmentType_Mandatory Convertible Securities  
Holdings [Line Items]  
Percent of Net Asset Value 14.40%
C000002921 | Semiconductors  
Holdings [Line Items]  
Percent of Net Asset Value 4.60%
C000002921 | Health Care  
Holdings [Line Items]  
Percent of Net Asset Value 23.40%
C000002921 | Computer Software and Services  
Holdings [Line Items]  
Percent of Net Asset Value 10.30%
C000002921 | Other Industry sectors  
Holdings [Line Items]  
Percent of Net Asset Value 23.90%
C000002921 | Financial Services  
Holdings [Line Items]  
Percent of Net Asset Value 9.20%
C000002921 | Other Assets and Liabilities (Net)  
Holdings [Line Items]  
Percent of Net Asset Value 0.50%
C000002921 | Energy and Utilities: Services  
Holdings [Line Items]  
Percent of Net Asset Value 10.30%
C000002921 | Energy and Energy Services  
Holdings [Line Items]  
Percent of Net Asset Value 8.40%
C000002921 | Aerospace and Defense  
Holdings [Line Items]  
Percent of Net Asset Value 6.00%
C000002921 | Metals and Mining  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
C000061065 | PPL Capital Funding Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 4.10%
C000061065 | Bridgebio Pharma Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
C000061065 | Hewlett Packard Enterprise Co.  
Holdings [Line Items]  
Percent of Net Asset Value 2.80%
C000061065 | Digital Realty Trust LP  
Holdings [Line Items]  
Percent of Net Asset Value 2.80%
C000061065 | Microchip Technology Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
C000061065 | BrightSpring Health Services Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
C000061065 | Alibaba Group Holding Ltd.  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
C000061065 | Lumentum Holdings Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
C000061065 | Applied Digital Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 2.30%
C000061065 | OSI Systems Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.30%
C000061065 | InvestmentType_U.S. Government Obligations  
Holdings [Line Items]  
Percent of Net Asset Value 1.90%
C000061065 | InvestmentType_Convertible Corporate Bonds  
Holdings [Line Items]  
Percent of Net Asset Value 83.20%
C000061065 | InvestmentType_Mandatory Convertible Securities  
Holdings [Line Items]  
Percent of Net Asset Value 14.40%
C000061065 | Semiconductors  
Holdings [Line Items]  
Percent of Net Asset Value 4.60%
C000061065 | Health Care  
Holdings [Line Items]  
Percent of Net Asset Value 23.40%
C000061065 | Computer Software and Services  
Holdings [Line Items]  
Percent of Net Asset Value 10.30%
C000061065 | Other Industry sectors  
Holdings [Line Items]  
Percent of Net Asset Value 23.90%
C000061065 | Financial Services  
Holdings [Line Items]  
Percent of Net Asset Value 9.20%
C000061065 | Other Assets and Liabilities (Net)  
Holdings [Line Items]  
Percent of Net Asset Value 0.50%
C000061065 | Energy and Utilities: Services  
Holdings [Line Items]  
Percent of Net Asset Value 10.30%
C000061065 | Energy and Energy Services  
Holdings [Line Items]  
Percent of Net Asset Value 8.40%
C000061065 | Aerospace and Defense  
Holdings [Line Items]  
Percent of Net Asset Value 6.00%
C000061065 | Metals and Mining  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
C000002919 | PPL Capital Funding Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 4.10%
C000002919 | Bridgebio Pharma Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
C000002919 | Hewlett Packard Enterprise Co.  
Holdings [Line Items]  
Percent of Net Asset Value 2.80%
C000002919 | Digital Realty Trust LP  
Holdings [Line Items]  
Percent of Net Asset Value 2.80%
C000002919 | Microchip Technology Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
C000002919 | BrightSpring Health Services Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
C000002919 | Alibaba Group Holding Ltd.  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
C000002919 | Lumentum Holdings Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
C000002919 | Applied Digital Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 2.30%
C000002919 | OSI Systems Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.30%
C000002919 | InvestmentType_U.S. Government Obligations  
Holdings [Line Items]  
Percent of Net Asset Value 1.90%
C000002919 | InvestmentType_Convertible Corporate Bonds  
Holdings [Line Items]  
Percent of Net Asset Value 83.20%
C000002919 | InvestmentType_Mandatory Convertible Securities  
Holdings [Line Items]  
Percent of Net Asset Value 14.40%
C000002919 | Semiconductors  
Holdings [Line Items]  
Percent of Net Asset Value 4.60%
C000002919 | Health Care  
Holdings [Line Items]  
Percent of Net Asset Value 23.40%
C000002919 | Computer Software and Services  
Holdings [Line Items]  
Percent of Net Asset Value 10.30%
C000002919 | Other Industry sectors  
Holdings [Line Items]  
Percent of Net Asset Value 23.90%
C000002919 | Financial Services  
Holdings [Line Items]  
Percent of Net Asset Value 9.20%
C000002919 | Other Assets and Liabilities (Net)  
Holdings [Line Items]  
Percent of Net Asset Value 0.50%
C000002919 | Energy and Utilities: Services  
Holdings [Line Items]  
Percent of Net Asset Value 10.30%
C000002919 | Energy and Energy Services  
Holdings [Line Items]  
Percent of Net Asset Value 8.40%
C000002919 | Aerospace and Defense  
Holdings [Line Items]  
Percent of Net Asset Value 6.00%
C000002919 | Metals and Mining  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
C000002918 | Amazon.com Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
C000002918 | NextEra Energy Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.70%
C000002918 | CSX Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
C000002918 | Johnson & Johnson  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
C000002918 | Thermo Fisher Scientific Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
C000002918 | Berkshire Hathaway Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
C000002918 | RB Global Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
C000002918 | Alphabet Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
C000002918 | The Home Depot Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
C000002918 | Exxon Mobil Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
C000002918 | InvestmentType_Common Stocks  
Holdings [Line Items]  
Percent of Net Asset Value 99.60%
C000002918 | InvestmentType_Short Term Investment  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
C000002918 | Diversified Industrial  
Holdings [Line Items]  
Percent of Net Asset Value 8.30%
C000002918 | Health Care  
Holdings [Line Items]  
Percent of Net Asset Value 9.40%
C000002918 | Computer Software and Services  
Holdings [Line Items]  
Percent of Net Asset Value 7.90%
C000002918 | Retail  
Holdings [Line Items]  
Percent of Net Asset Value 10.00%
C000002918 | Other Industry sectors  
Holdings [Line Items]  
Percent of Net Asset Value 26.80%
C000002918 | Financial Services  
Holdings [Line Items]  
Percent of Net Asset Value 19.80%
C000002918 | Energy: Oil  
Holdings [Line Items]  
Percent of Net Asset Value 6.10%
C000002918 | Food and Beverage  
Holdings [Line Items]  
Percent of Net Asset Value 4.40%
C000002918 | Other Assets and Liabilities (Net)  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
C000002918 | Energy and Utilities: Integrated  
Holdings [Line Items]  
Percent of Net Asset Value 7.30%
C000002916 | Amazon.com Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
C000002916 | NextEra Energy Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.70%
C000002916 | CSX Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
C000002916 | Johnson & Johnson  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
C000002916 | Thermo Fisher Scientific Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
C000002916 | Berkshire Hathaway Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
C000002916 | RB Global Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
C000002916 | Alphabet Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
C000002916 | The Home Depot Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
C000002916 | Exxon Mobil Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
C000002916 | InvestmentType_Common Stocks  
Holdings [Line Items]  
Percent of Net Asset Value 99.60%
C000002916 | InvestmentType_Short Term Investment  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
C000002916 | Diversified Industrial  
Holdings [Line Items]  
Percent of Net Asset Value 8.30%
C000002916 | Health Care  
Holdings [Line Items]  
Percent of Net Asset Value 9.40%
C000002916 | Computer Software and Services  
Holdings [Line Items]  
Percent of Net Asset Value 7.90%
C000002916 | Retail  
Holdings [Line Items]  
Percent of Net Asset Value 10.00%
C000002916 | Other Industry sectors  
Holdings [Line Items]  
Percent of Net Asset Value 26.80%
C000002916 | Financial Services  
Holdings [Line Items]  
Percent of Net Asset Value 19.80%
C000002916 | Energy: Oil  
Holdings [Line Items]  
Percent of Net Asset Value 6.10%
C000002916 | Food and Beverage  
Holdings [Line Items]  
Percent of Net Asset Value 4.40%
C000002916 | Other Assets and Liabilities (Net)  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
C000002916 | Energy and Utilities: Integrated  
Holdings [Line Items]  
Percent of Net Asset Value 7.30%
C000061064 | Amazon.com Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
C000061064 | NextEra Energy Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.70%
C000061064 | CSX Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
C000061064 | Johnson & Johnson  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
C000061064 | Thermo Fisher Scientific Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
C000061064 | Berkshire Hathaway Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
C000061064 | RB Global Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
C000061064 | Alphabet Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
C000061064 | The Home Depot Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
C000061064 | Exxon Mobil Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
C000061064 | InvestmentType_Common Stocks  
Holdings [Line Items]  
Percent of Net Asset Value 99.60%
C000061064 | InvestmentType_Short Term Investment  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
C000061064 | Diversified Industrial  
Holdings [Line Items]  
Percent of Net Asset Value 8.30%
C000061064 | Health Care  
Holdings [Line Items]  
Percent of Net Asset Value 9.40%
C000061064 | Computer Software and Services  
Holdings [Line Items]  
Percent of Net Asset Value 7.90%
C000061064 | Retail  
Holdings [Line Items]  
Percent of Net Asset Value 10.00%
C000061064 | Other Industry sectors  
Holdings [Line Items]  
Percent of Net Asset Value 26.80%
C000061064 | Financial Services  
Holdings [Line Items]  
Percent of Net Asset Value 19.80%
C000061064 | Energy: Oil  
Holdings [Line Items]  
Percent of Net Asset Value 6.10%
C000061064 | Food and Beverage  
Holdings [Line Items]  
Percent of Net Asset Value 4.40%
C000061064 | Other Assets and Liabilities (Net)  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
C000061064 | Energy and Utilities: Integrated  
Holdings [Line Items]  
Percent of Net Asset Value 7.30%
C000002917 | Amazon.com Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
C000002917 | NextEra Energy Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.70%
C000002917 | CSX Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
C000002917 | Johnson & Johnson  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
C000002917 | Thermo Fisher Scientific Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
C000002917 | Berkshire Hathaway Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
C000002917 | RB Global Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
C000002917 | Alphabet Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
C000002917 | The Home Depot Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
C000002917 | Exxon Mobil Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
C000002917 | InvestmentType_Common Stocks  
Holdings [Line Items]  
Percent of Net Asset Value 99.60%
C000002917 | InvestmentType_Short Term Investment  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
C000002917 | Diversified Industrial  
Holdings [Line Items]  
Percent of Net Asset Value 8.30%
C000002917 | Health Care  
Holdings [Line Items]  
Percent of Net Asset Value 9.40%
C000002917 | Computer Software and Services  
Holdings [Line Items]  
Percent of Net Asset Value 7.90%
C000002917 | Retail  
Holdings [Line Items]  
Percent of Net Asset Value 10.00%
C000002917 | Other Industry sectors  
Holdings [Line Items]  
Percent of Net Asset Value 26.80%
C000002917 | Financial Services  
Holdings [Line Items]  
Percent of Net Asset Value 19.80%
C000002917 | Energy: Oil  
Holdings [Line Items]  
Percent of Net Asset Value 6.10%
C000002917 | Food and Beverage  
Holdings [Line Items]  
Percent of Net Asset Value 4.40%
C000002917 | Other Assets and Liabilities (Net)  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
C000002917 | Energy and Utilities: Integrated  
Holdings [Line Items]  
Percent of Net Asset Value 7.30%
C000002928 | Myers Industries Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.90%
C000002928 | Astronics Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 2.90%
C000002928 | Gencor Industries Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.10%
C000002928 | Park-Ohio Holdings Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 2.10%
C000002928 | Burnham Holdings Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.00%
C000002928 | The Monarch Cement Co.  
Holdings [Line Items]  
Percent of Net Asset Value 1.80%
C000002928 | Rush Enterprises Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 1.70%
C000002928 | Capital City Bank Group Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 1.60%
C000002928 | Nobility Homes Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 1.60%
C000002928 | L.B. Foster Co.  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
C000002928 | InvestmentType_Common Stocks  
Holdings [Line Items]  
Percent of Net Asset Value 97.80%
C000002928 | InvestmentType_U.S. Government Obligations  
Holdings [Line Items]  
Percent of Net Asset Value 2.10%
C000002928 | InvestmentType_Preferred Stocks  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
C000002928 | Diversified Industrial  
Holdings [Line Items]  
Percent of Net Asset Value 12.90%
C000002928 | Health Care  
Holdings [Line Items]  
Percent of Net Asset Value 4.90%
C000002928 | Electronics  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
C000002928 | Other Industry sectors  
Holdings [Line Items]  
Percent of Net Asset Value 46.70%
C000002928 | Financial Services  
Holdings [Line Items]  
Percent of Net Asset Value 15.10%
C000002928 | Equipment and Supplies  
Holdings [Line Items]  
Percent of Net Asset Value 4.80%
C000002928 | Aviation: Parts and Services  
Holdings [Line Items]  
Percent of Net Asset Value 4.20%
C000002928 | Building and Construction  
Holdings [Line Items]  
Percent of Net Asset Value 4.10%
C000002928 | Machinery  
Holdings [Line Items]  
Percent of Net Asset Value 3.70%
C000002930 | Myers Industries Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.90%
C000002930 | Astronics Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 2.90%
C000002930 | Gencor Industries Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.10%
C000002930 | Park-Ohio Holdings Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 2.10%
C000002930 | Burnham Holdings Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.00%
C000002930 | The Monarch Cement Co.  
Holdings [Line Items]  
Percent of Net Asset Value 1.80%
C000002930 | Rush Enterprises Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 1.70%
C000002930 | Capital City Bank Group Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 1.60%
C000002930 | Nobility Homes Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 1.60%
C000002930 | L.B. Foster Co.  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
C000002930 | InvestmentType_Common Stocks  
Holdings [Line Items]  
Percent of Net Asset Value 97.80%
C000002930 | InvestmentType_U.S. Government Obligations  
Holdings [Line Items]  
Percent of Net Asset Value 2.10%
C000002930 | InvestmentType_Preferred Stocks  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
C000002930 | Diversified Industrial  
Holdings [Line Items]  
Percent of Net Asset Value 12.90%
C000002930 | Health Care  
Holdings [Line Items]  
Percent of Net Asset Value 4.90%
C000002930 | Electronics  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
C000002930 | Other Industry sectors  
Holdings [Line Items]  
Percent of Net Asset Value 46.70%
C000002930 | Financial Services  
Holdings [Line Items]  
Percent of Net Asset Value 15.10%
C000002930 | Equipment and Supplies  
Holdings [Line Items]  
Percent of Net Asset Value 4.80%
C000002930 | Aviation: Parts and Services  
Holdings [Line Items]  
Percent of Net Asset Value 4.20%
C000002930 | Building and Construction  
Holdings [Line Items]  
Percent of Net Asset Value 4.10%
C000002930 | Machinery  
Holdings [Line Items]  
Percent of Net Asset Value 3.70%
C000061067 | Myers Industries Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.90%
C000061067 | Astronics Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 2.90%
C000061067 | Gencor Industries Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.10%
C000061067 | Park-Ohio Holdings Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 2.10%
C000061067 | Burnham Holdings Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.00%
C000061067 | The Monarch Cement Co.  
Holdings [Line Items]  
Percent of Net Asset Value 1.80%
C000061067 | Rush Enterprises Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 1.70%
C000061067 | Capital City Bank Group Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 1.60%
C000061067 | Nobility Homes Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 1.60%
C000061067 | L.B. Foster Co.  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
C000061067 | InvestmentType_Common Stocks  
Holdings [Line Items]  
Percent of Net Asset Value 97.80%
C000061067 | InvestmentType_U.S. Government Obligations  
Holdings [Line Items]  
Percent of Net Asset Value 2.10%
C000061067 | InvestmentType_Preferred Stocks  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
C000061067 | Diversified Industrial  
Holdings [Line Items]  
Percent of Net Asset Value 12.90%
C000061067 | Health Care  
Holdings [Line Items]  
Percent of Net Asset Value 4.90%
C000061067 | Electronics  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
C000061067 | Other Industry sectors  
Holdings [Line Items]  
Percent of Net Asset Value 46.70%
C000061067 | Financial Services  
Holdings [Line Items]  
Percent of Net Asset Value 15.10%
C000061067 | Equipment and Supplies  
Holdings [Line Items]  
Percent of Net Asset Value 4.80%
C000061067 | Aviation: Parts and Services  
Holdings [Line Items]  
Percent of Net Asset Value 4.20%
C000061067 | Building and Construction  
Holdings [Line Items]  
Percent of Net Asset Value 4.10%
C000061067 | Machinery  
Holdings [Line Items]  
Percent of Net Asset Value 3.70%
C000002927 | Myers Industries Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.90%
C000002927 | Astronics Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 2.90%
C000002927 | Gencor Industries Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.10%
C000002927 | Park-Ohio Holdings Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 2.10%
C000002927 | Burnham Holdings Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.00%
C000002927 | The Monarch Cement Co.  
Holdings [Line Items]  
Percent of Net Asset Value 1.80%
C000002927 | Rush Enterprises Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 1.70%
C000002927 | Capital City Bank Group Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 1.60%
C000002927 | Nobility Homes Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 1.60%
C000002927 | L.B. Foster Co.  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
C000002927 | InvestmentType_Common Stocks  
Holdings [Line Items]  
Percent of Net Asset Value 97.80%
C000002927 | InvestmentType_U.S. Government Obligations  
Holdings [Line Items]  
Percent of Net Asset Value 2.10%
C000002927 | InvestmentType_Preferred Stocks  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
C000002927 | Diversified Industrial  
Holdings [Line Items]  
Percent of Net Asset Value 12.90%
C000002927 | Health Care  
Holdings [Line Items]  
Percent of Net Asset Value 4.90%
C000002927 | Electronics  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
C000002927 | Other Industry sectors  
Holdings [Line Items]  
Percent of Net Asset Value 46.70%
C000002927 | Financial Services  
Holdings [Line Items]  
Percent of Net Asset Value 15.10%
C000002927 | Equipment and Supplies  
Holdings [Line Items]  
Percent of Net Asset Value 4.80%
C000002927 | Aviation: Parts and Services  
Holdings [Line Items]  
Percent of Net Asset Value 4.20%
C000002927 | Building and Construction  
Holdings [Line Items]  
Percent of Net Asset Value 4.10%
C000002927 | Machinery  
Holdings [Line Items]  
Percent of Net Asset Value 3.70%