S000039473 [Member] Annual Total Returns |
12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
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, 2015 |
|
| Sit Quality Income Fund | Sit Quality Income Fund - Class S | ||||||||||
| Prospectus [Line Items] | ||||||||||
| Annual Return [Percent] | 4.26% | 4.37% | (1.66%) | 1.47% | 2.96% | 3.13% | 0.90% | 1.16% | 0.79% | (0.27%) |