Shareholder Report, Line Graph (Details) - USD ($) |
12 Months Ended | 24 Months Ended | 36 Months Ended | 48 Months Ended | 60 Months Ended | 72 Months Ended | 84 Months Ended | 96 Months Ended | 108 Months Ended | 120 Months Ended | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2025 |
Dec. 31, 2016 |
Dec. 31, 2017 |
Dec. 31, 2018 |
Dec. 31, 2019 |
Dec. 31, 2020 |
Dec. 31, 2021 |
Dec. 31, 2022 |
Dec. 31, 2023 |
Dec. 31, 2024 |
Dec. 31, 2025 |
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| C000032073 [Member] | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | MIDAS DISCOVERY | |||||||||||
| Accumulated Value | $ 10,000 | $ 16,479 | $ 17,465 | $ 15,211 | $ 19,859 | $ 21,972 | $ 17,746 | $ 15,775 | $ 15,493 | $ 16,620 | $ 49,155 | |
| C000119766 [Member] | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | MIDAS SPECIAL OPPORTUNITIES | |||||||||||
| Accumulated Value | 10,000 | 11,344.39 | 13,374.39 | 11,856.16 | 15,831.36 | 17,995.61 | 24,886.01 | 19,066.67 | 25,301.8 | 32,033.37 | 41,601.02 | |
| Standard & Poor's 500 Index [Member] | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | S&P 500 Index Benchmark (reflects no deduction for fees, expenses, or taxes) | |||||||||||
| Accumulated Value | $ 10,000 | $ 11,196 | 13,640 | 13,043 | 17,150 | 20,305 | 26,135 | 21,402 | 27,029 | 33,791 | 39,833 | |
| Standard And Poor s 500 C000119766 Index [Member] | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Accumulated Value | $ 13,640.09 | $ 13,042.65 | $ 17,149.78 | $ 20,305.34 | $ 26,135.01 | $ 21,401.96 | $ 27,028.53 | $ 33,791.07 | $ 39,832.91 | |||