Shareholder Report, Line Graph (Details) - USD ($) |
1 Months Ended | ||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
May 31, 2026 |
Nov. 30, 2025 |
May 31, 2025 |
Nov. 30, 2024 |
May 31, 2024 |
Nov. 30, 2023 |
May 31, 2023 |
Nov. 30, 2022 |
May 31, 2022 |
Nov. 30, 2021 |
May 31, 2021 |
Nov. 30, 2020 |
May 31, 2020 |
Nov. 30, 2019 |
May 31, 2019 |
Nov. 30, 2018 |
May 31, 2018 |
Nov. 30, 2017 |
May 31, 2017 |
Nov. 30, 2016 |
May 31, 2016 |
|
| Tarkio Fund | |||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||
| Accumulated Value | $ 41,624 | $ 33,239 | $ 25,216 | $ 29,135 | $ 22,991 | $ 19,279 | $ 18,382 | $ 17,525 | $ 20,340 | $ 23,420 | $ 24,490 | $ 17,991 | $ 12,709 | $ 15,135 | $ 13,192 | $ 13,845 | $ 14,554 | $ 15,216 | $ 13,207 | $ 11,785 | $ 10,000 |
| S&P 500 Index | |||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||
| Accumulated Value | $ 42,767 | $ 38,412 | $ 32,953 | $ 33,402 | $ 29,027 | $ 24,947 | $ 22,645 | $ 21,914 | $ 22,002 | $ 24,140 | $ 22,071 | $ 18,874 | $ 15,732 | $ 16,069 | $ 13,942 | $ 13,840 | $ 13,434 | $ 13,025 | $ 11,746 | $ 10,601 | $ 10,000 |