Shareholder Report, Average Annual Return (Details) |
12 Months Ended | 60 Months Ended | 120 Months Ended |
|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2026 |
Jun. 30, 2026 |
|
| C000032269 | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Sit Mid Cap Growth Fund | ||
| Without Sales Load [Member] | C000032269 | |||
| Average Annual Return [Line Items] | |||
| Average Annual Return, Percent | 19.35% | 7.16% | 11.99% |
| Russell 3000® Index | |||
| Average Annual Return [Line Items] | |||
| Average Annual Return, Percent | 22.82% | 12.31% | 15.06% |
| Russell Midcap® Growth Index | |||
| Average Annual Return [Line Items] | |||
| Average Annual Return, Percent | 6.17% | 6.03% | 13.04% |