NSTS Bancorp, Inc. Annual report [Section 13 and 15(d), not S-K Item 405]

Note 10 - Benefit Plans (Details Textual) - Benefit Plan 401 K [Member] - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	6.00%
Defined Contribution Plan, Employer Discretionary Contribution Amount	$ 206,000	$ 161,000
Defined Benefit Plan, Plan Assets, Contributions by Employer	$ 0	$ 0