S000003463 [Member] Average Annual Total Returns |
12 Months Ended | 60 Months Ended | 120 Months Ended | ||
|---|---|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2025 |
Dec. 31, 2025 |
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| MSCI Emerging Markets Index (reflects no deduction for fees, expenses or taxes) | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | [1] | 30.58% | 1.69% | 5.87% | |
| Sit Developing Markets Growth Fund | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | 36.13% | 4.61% | 8.86% | ||
| Sit Developing Markets Growth Fund | After Taxes on Distributions | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | 35.83% | 4.03% | 8.40% | ||
| Sit Developing Markets Growth Fund | After Taxes on Distributions and Sales | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | 21.58% | 3.44% | 7.13% | ||
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