Average Annual Return (Details) - Volumetric Fund - C000032757 |
12 Months Ended | 60 Months Ended | 120 Months Ended |
|---|---|---|---|
Dec. 31, 2024 |
Dec. 31, 2024 |
Dec. 31, 2024 |
|
| Average Annual Return, Percent | 12.85% | 7.14% | 6.62% |
| S&P 500 Index | |||
| Average Annual Return, Percent | 25.02% | 14.53% | 13.10% |
| FTSE 3 Month T-Bill Index | |||
| Average Annual Return, Percent | 5.45% | 2.54% | 1.79% |