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

Note 4 - Allowance for Loan Losses - Aging of Bank's Loan Portfolio (Details)

Note 4 - Allowance for Loan Losses - Aging of Bank's Loan Portfolio (Details) - USD ($)	Dec. 31, 2024	Dec. 31, 2023	Jan. 01, 2023
Loans	$ 130,907,000	$ 120,783,000
Non-accrual	0	200,000	$ 154,000
First Mortgage Loans [Member]
Loans	130,625,000	120,535,000
First Mortgage Loans [Member] \| One To Four Family Residential [Member]
Loans	119,409,000	111,081,000
Non-accrual	0	200,000
First Mortgage Loans [Member] \| Multifamily [Member]
Loans	3,368,000	3,111,000
Non-accrual	0	0
First Mortgage Loans [Member] \| Commercial Real Estate [Member]
Loans	4,197,000	3,835,000
Non-accrual	0	0
First Mortgage Loans [Member] \| Construction Loans [Member]
Loans	3,651,000	2,508,000
Non-accrual	0	0
Consumer Portfolio Segment [Member]
Loans	282,000	248,000
Non-accrual	0	0
Financial Asset, 31 to 89 Days Past Due [Member]
Loans	371,000	131,000
Financial Asset, 31 to 89 Days Past Due [Member] \| First Mortgage Loans [Member] \| One To Four Family Residential [Member]
Loans	371,000	131,000
Financial Asset, 31 to 89 Days Past Due [Member] \| First Mortgage Loans [Member] \| Multifamily [Member]
Loans	0	0
Financial Asset, 31 to 89 Days Past Due [Member] \| First Mortgage Loans [Member] \| Commercial Real Estate [Member]
Loans	0	0
Financial Asset, 31 to 89 Days Past Due [Member] \| First Mortgage Loans [Member] \| Construction Loans [Member]
Loans	0	0
Financial Asset, 31 to 89 Days Past Due [Member] \| Consumer Portfolio Segment [Member]
Loans	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] \| First Mortgage Loans [Member] \| One To Four Family Residential [Member]
Loans	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] \| First Mortgage Loans [Member] \| Multifamily [Member]
Loans	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] \| First Mortgage Loans [Member] \| Commercial Real Estate [Member]
Loans	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] \| First Mortgage Loans [Member] \| Construction Loans [Member]
Loans	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] \| Consumer Portfolio Segment [Member]
Loans	0	0
Financial Asset, Past Due [Member]
Loans	371,000	331,000
Financial Asset, Past Due [Member] \| First Mortgage Loans [Member] \| One To Four Family Residential [Member]
Loans	371,000	331,000
Financial Asset, Past Due [Member] \| First Mortgage Loans [Member] \| Multifamily [Member]
Loans	0	0
Financial Asset, Past Due [Member] \| First Mortgage Loans [Member] \| Commercial Real Estate [Member]
Loans	0	0
Financial Asset, Past Due [Member] \| First Mortgage Loans [Member] \| Construction Loans [Member]
Loans	0	0
Financial Asset, Past Due [Member] \| Consumer Portfolio Segment [Member]
Loans	0	0
Financial Asset, Not Past Due [Member]
Loans	130,536,000	120,452,000
Financial Asset, Not Past Due [Member] \| First Mortgage Loans [Member] \| One To Four Family Residential [Member]
Loans	119,038,000	110,750,000
Financial Asset, Not Past Due [Member] \| First Mortgage Loans [Member] \| Multifamily [Member]
Loans	3,368,000	3,111,000
Financial Asset, Not Past Due [Member] \| First Mortgage Loans [Member] \| Commercial Real Estate [Member]
Loans	4,197,000	3,835,000
Financial Asset, Not Past Due [Member] \| First Mortgage Loans [Member] \| Construction Loans [Member]
Loans	3,651,000	2,508,000
Financial Asset, Not Past Due [Member] \| Consumer Portfolio Segment [Member]
Loans	$ 282,000	$ 248,000