Shareholder Report, Average Annual Return (Details) |
12 Months Ended | 60 Months Ended | 120 Months Ended |
|---|---|---|---|
May 31, 2026 |
May 31, 2026 |
May 31, 2026 |
|
| Tarkio Fund | |||
| Average Annual Return [Line Items] | |||
| Average Annual Return, Percent | 65.07% | 11.19% | 15.33% |
| S&P 500 Index | |||
| Average Annual Return [Line Items] | |||
| Average Annual Return, Percent | 29.78% | 14.16% | 15.65% |