NSTS Bancorp, Inc. Quarterly report [Sections 13 or 15(d)]

Note 3 - Loans and Allowance for Credit Losses - Loans on Nonaccrual Status (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025	Jan. 01, 2025
Nonaccrual, No Allowance	$ 283	$ 284
Non-Accrual	283	284	$ 0
First Mortgage Loans [Member] \| One To Four Family Residential [Member]
Nonaccrual, No Allowance	283	284
Non-Accrual	283	284	0
First Mortgage Loans [Member] \| Multifamily [Member]
Nonaccrual, No Allowance	0	0
Non-Accrual	0	0	0
First Mortgage Loans [Member] \| Commercial Real Estate [Member]
Nonaccrual, No Allowance	0	0
Non-Accrual	0	0	0
First Mortgage Loans [Member] \| Construction Loans [Member]
Nonaccrual, No Allowance	0	0
Non-Accrual	0	0	0
Consumer Portfolio Segment [Member]
Nonaccrual, No Allowance	0	0
Non-Accrual	$ 0	$ 0	$ 0