NSTS Bancorp, Inc. Annual report pursuant to Section 13 and 15(d)

Note 11 - Benefit Plans (Details Textual) - USD ($)	12 Months Ended
Note 11 - Benefit Plans (Details Textual) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Benefit Plan 401 K [Member]
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	6.00%
Defined Contribution Plan, Employer Discretionary Contribution Amount	$ 156,000	$ 163,000
Profit-Sharing Plan [Member]
Defined Benefit Plan, Plan Assets, Contributions by Employer	$ 0

Amount of contribution received by defined benefit plan from employer which increases plan assets.