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

Note 4 - Allowance for Loan Losses - Loans on Nonaccrual Status (Details) - USD ($)	Dec. 31, 2024	Dec. 31, 2023	Jan. 01, 2023
Nonaccrual, No Allowance	$ 0	$ 200,000
Non-accrual	0	200,000	$ 154,000
First Mortgage Loans [Member] \| One To Four Family Residential [Member]
Nonaccrual, No Allowance	0	200,000
Non-accrual	0	200,000
First Mortgage Loans [Member] \| Multifamily [Member]
Nonaccrual, No Allowance	0	0
Non-accrual	0	0
First Mortgage Loans [Member] \| Commercial Real Estate [Member]
Nonaccrual, No Allowance	0	0
Non-accrual	0	0
First Mortgage Loans [Member] \| Construction Loans [Member]
Nonaccrual, No Allowance	0	0
Non-accrual	0	0
Consumer Portfolio Segment [Member]
Nonaccrual, No Allowance	0	0
Non-accrual	$ 0	$ 0