Note 3 - Loans Receivable - Collateral Dependent Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Loans, individually evaluated	$ 20,600	$ 20,000
Single Family Residence [Member]
Loans, individually evaluated	860	1,456
Multi Family Housing [Member]
Loans, individually evaluated	707
Condominium [Member]
Loans, individually evaluated	14,556	15,100
Automobiles [Member]
Loans, individually evaluated	180	180
Business Assets [Member]
Loans, individually evaluated	1,820	652
Collateral Pledged [Member]
Loans, individually evaluated	18,123	17,388
Real Estate Portfolio Segment [Member] | One-to-four Family Loan [Member] | Single Family Residence [Member]
Loans, individually evaluated	830	1,426
Real Estate Portfolio Segment [Member] | One-to-four Family Loan [Member] | Multi Family Housing [Member]
Loans, individually evaluated	0
Real Estate Portfolio Segment [Member] | One-to-four Family Loan [Member] | Condominium [Member]
Loans, individually evaluated	0	0
Real Estate Portfolio Segment [Member] | One-to-four Family Loan [Member] | Automobiles [Member]
Loans, individually evaluated	0	0
Real Estate Portfolio Segment [Member] | One-to-four Family Loan [Member] | Business Assets [Member]
Loans, individually evaluated	0	0
Real Estate Portfolio Segment [Member] | One-to-four Family Loan [Member] | Collateral Pledged [Member]
Loans, individually evaluated	830	1,426
Real Estate Portfolio Segment [Member] | Multi-family Loan [Member] | Single Family Residence [Member]
Loans, individually evaluated	0
Real Estate Portfolio Segment [Member] | Multi-family Loan [Member] | Multi Family Housing [Member]
Loans, individually evaluated	707
Real Estate Portfolio Segment [Member] | Multi-family Loan [Member] | Condominium [Member]
Loans, individually evaluated	0
Real Estate Portfolio Segment [Member] | Multi-family Loan [Member] | Automobiles [Member]
Loans, individually evaluated	0
Real Estate Portfolio Segment [Member] | Multi-family Loan [Member] | Business Assets [Member]
Loans, individually evaluated	0
Real Estate Portfolio Segment [Member] | Multi-family Loan [Member] | Collateral Pledged [Member]
Loans, individually evaluated	707
Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Single Family Residence [Member]
Loans, individually evaluated	0	0
Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Multi Family Housing [Member]
Loans, individually evaluated	0
Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Condominium [Member]
Loans, individually evaluated	14,437	14,981
Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Automobiles [Member]
Loans, individually evaluated	0	0
Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Business Assets [Member]
Loans, individually evaluated	0	0
Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Collateral Pledged [Member]
Loans, individually evaluated	14,437	14,981
Consumer Portfolio Segment [Member] | Home Equity Loan [Member] | Single Family Residence [Member]
Loans, individually evaluated	30	30
Consumer Portfolio Segment [Member] | Home Equity Loan [Member] | Multi Family Housing [Member]
Loans, individually evaluated	0
Consumer Portfolio Segment [Member] | Home Equity Loan [Member] | Condominium [Member]
Loans, individually evaluated	0	0
Consumer Portfolio Segment [Member] | Home Equity Loan [Member] | Automobiles [Member]
Loans, individually evaluated	0	0
Consumer Portfolio Segment [Member] | Home Equity Loan [Member] | Business Assets [Member]
Loans, individually evaluated	0	0
Consumer Portfolio Segment [Member] | Home Equity Loan [Member] | Collateral Pledged [Member]
Loans, individually evaluated	30	30
Consumer Portfolio Segment [Member] | Automobile and Other Loan [Member] | Single Family Residence [Member]
Loans, individually evaluated	0	0
Consumer Portfolio Segment [Member] | Automobile and Other Loan [Member] | Multi Family Housing [Member]
Loans, individually evaluated	0
Consumer Portfolio Segment [Member] | Automobile and Other Loan [Member] | Condominium [Member]
Loans, individually evaluated	0	0
Consumer Portfolio Segment [Member] | Automobile and Other Loan [Member] | Automobiles [Member]
Loans, individually evaluated	180	180
Consumer Portfolio Segment [Member] | Automobile and Other Loan [Member] | Business Assets [Member]
Loans, individually evaluated	0	0
Consumer Portfolio Segment [Member] | Automobile and Other Loan [Member] | Collateral Pledged [Member]
Loans, individually evaluated	180	180
Commercial Portfolio Segment [Member] | Single Family Residence [Member]
Loans, individually evaluated	0	0
Commercial Portfolio Segment [Member] | Multi Family Housing [Member]
Loans, individually evaluated	0
Commercial Portfolio Segment [Member] | Condominium [Member]
Loans, individually evaluated	119	119
Commercial Portfolio Segment [Member] | Automobiles [Member]
Loans, individually evaluated	0	0
Commercial Portfolio Segment [Member] | Business Assets [Member]
Loans, individually evaluated	1,820	652
Commercial Portfolio Segment [Member] | Collateral Pledged [Member]
Loans, individually evaluated	$ 1,939	$ 771