S000039473 [Member] Average Annual Total Returns

12 Months Ended

33 Months Ended

60 Months Ended

120 Months Ended

144 Months Ended

Mar. 31, 2025

Dec. 31, 2024

Dec. 31, 2024

Dec. 31, 2024

Dec. 31, 2024

Dec. 31, 2024

Prospectus [Line Items]

Average Annual Return, Percent

Bloomberg U.S. Aggregate Bond Index (reflects no deduction for fees, expenses or taxes)

Prospectus [Line Items]

Average Annual Return, Percent

^[1]

1.25%

(0.33%)

1.35%

Bloomberg 1-3 Year Government/Credit Index (reflects no deduction for fees, expenses or taxes)

Prospectus [Line Items]

Average Annual Return, Percent

^[2]

4.36%

1.58%

1.63%

Sit Quality Income Fund - Class S

Prospectus [Line Items]

Average Annual Return, Percent

4.26%

2.25%

1.69%

Performance Inception Date

Dec. 31, 2012

Sit Quality Income Fund - Class S | After Taxes on Distributions

Prospectus [Line Items]

Average Annual Return, Percent

2.44%

1.05%

0.81%

Performance Inception Date

Dec. 31, 2012

Sit Quality Income Fund - Class S | After Taxes on Distributions and Sales

Prospectus [Line Items]

Average Annual Return, Percent

2.49%

1.23%

0.92%

Performance Inception Date

Dec. 31, 2012

Sit Quality Income Fund - Class Y

Prospectus [Line Items]

Average Annual Return, Percent

4.63%

Performance Inception Date

Mar. 31, 2022

[1]

A broad-based securities market index that represents the overall domestic debt markets. Effective June 30, 2024, and pursuant to regulatory requirements, the Bloomberg U.S. Aggregate Bond Index replaced the Bloomberg 1‑3 Year Government/Credit Index as the Fund’s primary performance benchmark to represent a broad-based securities market index. The Fund continues to use the Bloomberg 1‑3 Year Government/Credit Index as an additional performance benchmark.

[2]

A more narrowly-based index that reflects the market sectors in which the Fund invests.