Note 3 - Loans and Allowance for Credit Losses - Aging of Bank's Loan Portfolio (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025	Jan. 01, 2025
Loans	$ 127,467	$ 129,464
Non-Accrual	2,411	284	$ 0
First Mortgage Loans [Member]
Loans	127,155	129,196
First Mortgage Loans [Member] \| One To Four Family Residential [Member]
Loans	116,514	118,222
Non-Accrual	2,411	284	0
First Mortgage Loans [Member] \| Multifamily [Member]
Loans	3,775	3,240
Non-Accrual	0	0	0
First Mortgage Loans [Member] \| Commercial Real Estate [Member]
Loans	3,846	3,813
Non-Accrual	0	0	0
First Mortgage Loans [Member] \| Construction Loans [Member]
Loans	3,020	3,921
Non-Accrual	0	0	0
Consumer Portfolio Segment [Member]
Loans	312	268
Non-Accrual	0	0	$ 0
Financial Asset, 31 to 89 Days Past Due [Member]
Loans	496	641
Financial Asset, 31 to 89 Days Past Due [Member] \| First Mortgage Loans [Member] \| One To Four Family Residential [Member]
Loans	89	641
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	407	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	2,907	925
Financial Asset, Past Due [Member] \| First Mortgage Loans [Member] \| One To Four Family Residential [Member]
Loans	2,500	925
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	407	0
Financial Asset, Past Due [Member] \| Consumer Portfolio Segment [Member]
Loans	0	0
Financial Asset, Not Past Due [Member]
Loans	124,560	128,539
Financial Asset, Not Past Due [Member] \| First Mortgage Loans [Member] \| One To Four Family Residential [Member]
Loans	114,014	117,297
Financial Asset, Not Past Due [Member] \| First Mortgage Loans [Member] \| Multifamily [Member]
Loans	3,775	3,240
Financial Asset, Not Past Due [Member] \| First Mortgage Loans [Member] \| Commercial Real Estate [Member]
Loans	3,846	3,813
Financial Asset, Not Past Due [Member] \| First Mortgage Loans [Member] \| Construction Loans [Member]
Loans	2,613	3,921
Financial Asset, Not Past Due [Member] \| Consumer Portfolio Segment [Member]
Loans	$ 312	$ 268