S000003467 [Member] Expense Example - Sit Tax-Free Income Fund |
Mar. 31, 2025
USD ($)
|
|---|---|
| Sit Tax-Free Income Fund - Class S | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | $ 97 |
| Expense Example, with Redemption, 3 Years | 304 |
| Expense Example, with Redemption, 5 Years | 528 |
| Expense Example, with Redemption, 10 Years | 1,171 |
| Sit Tax-Free Income Fund - Class Y | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | 7,175 |
| Expense Example, with Redemption, 3 Years | 22,460 |
| Expense Example, with Redemption, 5 Years | 39,082 |
| Expense Example, with Redemption, 10 Years | $ 87,281 |