Average Annual Total Returns - TANAKA Growth Fund |
12 Months Ended | 60 Months Ended | 120 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
Dec. 31, 2022 |
Dec. 31, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2025 |
Dec. 31, 2025 |
|
| Prospectus [Line Items] | ||||||||||||
| Average Annual Return, Percent | 39.29% | 19.35% | 12.78% | |||||||||
| After Taxes on Distributions | ||||||||||||
| Prospectus [Line Items] | ||||||||||||
| Average Annual Return, Percent | 34.90% | 17.83% | 12.06% | |||||||||
| After Taxes on Distributions and Sales | ||||||||||||
| Prospectus [Line Items] | ||||||||||||
| Average Annual Return, Percent | 25.37% | 15.47% | 10.57% | |||||||||
| Wilshiare 2500 Growth Index | ||||||||||||
| Prospectus [Line Items] | ||||||||||||
| Average Annual Return, Percent | 16.71% | 14.99% | 17.04% | |||||||||
| Class R | ||||||||||||
| Prospectus [Line Items] | ||||||||||||
| Average Annual Return, Percent | 39.29% | 18.10% | 50.24% | (22.62%) | 26.63% | 50.87% | 18.78% | (25.18%) | 7.28% | (4.45%) | ||