S000003467 [Member] Shareholder Fees - Sit Tax-Free Income Fund |
Mar. 31, 2025
USD ($)
|
|---|---|
| Sit Tax-Free Income Fund - Class S | |
| Prospectus [Line Items] | |
| Shareholder Fee, Other | $ 0 |
| Sit Tax-Free Income Fund - Class Y | |
| Prospectus [Line Items] | |
| Shareholder Fee, Other | $ 0 |