Shareholder Report, Holdings (Details)	Jun. 30, 2025
C000004198 \| Agnico Eagle Mines Ltd._0
Holdings [Line Items]
Percent of Net Asset Value	2.00%
C000004198 \| Newmont Corporation_0
Holdings [Line Items]
Percent of Net Asset Value	1.90%
C000004198 \| Barrick Mining Corporation_0
Holdings [Line Items]
Percent of Net Asset Value	1.80%
C000004198 \| Ubiquiti, Inc._0
Holdings [Line Items]
Percent of Net Asset Value	1.80%
C000004198 \| Charter Communications, Inc._0
Holdings [Line Items]
Percent of Net Asset Value	1.60%
C000004198 \| Campbell's Company (The)_0
Holdings [Line Items]
Percent of Net Asset Value	1.50%
C000004198 \| Colgate-Palmolive Company_0
Holdings [Line Items]
Percent of Net Asset Value	1.30%
C000004198 \| InterDigital, Inc._0
Holdings [Line Items]
Percent of Net Asset Value	1.20%
C000004198 \| Check Point Software Technologies Ltd._0
Holdings [Line Items]
Percent of Net Asset Value	1.20%
C000004198 \| Exelixis, Inc._0
Holdings [Line Items]
Percent of Net Asset Value	1.20%
C000004198 \| Warrants
Holdings [Line Items]
Percent of Net Asset Value	0.00%
C000004198 \| Money Market Funds
Holdings [Line Items]
Percent of Net Asset Value	49.90%
C000004198 \| Common Stocks
Holdings [Line Items]
Percent of Net Asset Value	104.80%
C000212809 \| Agnico Eagle Mines Ltd._0
Holdings [Line Items]
Percent of Net Asset Value	1.30%
C000212809 \| Newmont Corporation_0
Holdings [Line Items]
Percent of Net Asset Value	1.20%
C000212809 \| Barrick Mining Corporation_0
Holdings [Line Items]
Percent of Net Asset Value	1.20%
C000212809 \| Ubiquiti, Inc._0
Holdings [Line Items]
Percent of Net Asset Value	1.20%
C000212809 \| Charter Communications, Inc._0
Holdings [Line Items]
Percent of Net Asset Value	1.00%
C000212809 \| Campbell's Company (The)_0
Holdings [Line Items]
Percent of Net Asset Value	1.00%
C000212809 \| U.S. Treasury Notes_4.625_2035-02-15
Holdings [Line Items]
Percent of Net Asset Value	16.40%
C000212809 \| U.S. Treasury Bonds_4.75_2045-02-15
Holdings [Line Items]
Percent of Net Asset Value	3.50%
C000212809 \| U.S. Treasury Inflation-Protected Notes_1.75_2034-01-15
Holdings [Line Items]
Percent of Net Asset Value	1.80%
C000212809 \| U.S. Treasury Inflation-Protected Bonds_2.125_2054-02-15
Holdings [Line Items]
Percent of Net Asset Value	1.70%
C000212809 \| Warrants
Holdings [Line Items]
Percent of Net Asset Value	0.00%
C000212809 \| Money Market Funds
Holdings [Line Items]
Percent of Net Asset Value	31.60%
C000212809 \| Common Stocks
Holdings [Line Items]
Percent of Net Asset Value	66.40%
C000212809 \| U.S. Treasury Obligations
Holdings [Line Items]
Percent of Net Asset Value	23.30%
C000004199 \| Agnico Eagle Mines Ltd._0
Holdings [Line Items]
Percent of Net Asset Value	4.80%
C000004199 \| Newmont Corporation_0
Holdings [Line Items]
Percent of Net Asset Value	4.70%
C000004199 \| Barrick Mining Corporation_0
Holdings [Line Items]
Percent of Net Asset Value	4.50%
C000004199 \| U.S. Treasury Notes_4.625_2035-02-15
Holdings [Line Items]
Percent of Net Asset Value	34.70%
C000004199 \| U.S. Treasury Bonds_4.75_2045-02-15
Holdings [Line Items]
Percent of Net Asset Value	11.20%
C000004199 \| U.S. Treasury Inflation-Protected Notes_1.75_2034-01-15
Holdings [Line Items]
Percent of Net Asset Value	2.30%
C000004199 \| U.S. Treasury Inflation-Protected Notes_2.5_2029-01-15
Holdings [Line Items]
Percent of Net Asset Value	7.00%
C000004199 \| U.S. Treasury Inflation-Protected Notes_0.125_2030-01-15
Holdings [Line Items]
Percent of Net Asset Value	5.30%
C000004199 \| U.S. Treasury Notes_2.125_2026-05-31
Holdings [Line Items]
Percent of Net Asset Value	4.40%
C000004199 \| U.S. Treasury Notes_1.5_2026-08-15
Holdings [Line Items]
Percent of Net Asset Value	4.40%
C000004199 \| Warrants
Holdings [Line Items]
Percent of Net Asset Value	0.00%
C000004199 \| Money Market Funds
Holdings [Line Items]
Percent of Net Asset Value	6.60%
C000004199 \| Common Stocks
Holdings [Line Items]
Percent of Net Asset Value	20.30%
C000004199 \| U.S. Treasury Obligations
Holdings [Line Items]
Percent of Net Asset Value	72.10%
C000004199 \| Exchange-Traded Funds
Holdings [Line Items]
Percent of Net Asset Value	1.00%