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

Note 3 - Loans and Allowance for Credit Losses - Summary of Loans by Major Category (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025	Dec. 31, 2024
Loans	$ 128,485	$ 129,464
Net deferred loan costs	257	299
Allowance for credit losses on loans	(1,095)	(1,128)	$ (1,156)	$ (1,201)
Total loans, net	127,647	128,635
First Mortgage Loans [Member]
Loans	128,163	129,196
Consumer Portfolio Segment [Member]
Loans	322	268
Allowance for credit losses on loans	(3)	(2)	(2)	(2)
One To Four Family Residential [Member] \| First Mortgage Loans [Member]
Loans	116,914	118,222
Allowance for credit losses on loans	(956)	(989)	(1,034)	(1,056)
Multifamily [Member] \| First Mortgage Loans [Member]
Loans	3,425	3,240
Allowance for credit losses on loans	(39)	(39)	(37)	(37)
Commercial Real Estate [Member] \| First Mortgage Loans [Member]
Loans	3,797	3,813
Allowance for credit losses on loans	(34)	(37)	(38)	(41)
Construction Loans [Member] \| First Mortgage Loans [Member]
Loans	4,027	3,921
Allowance for credit losses on loans	$ (63)	$ (61)	$ (45)	$ (65)