Note 4 - Loans and Allowance for Loan Losses - Recorded Investments in Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Principal loan balance	$ 628,477	$ 621,246
Deferred loan origination fees and costs, net	1,130	1,168
Amortized cost basis in loans	629,607	622,414
Residential Portfolio Segment [Member] | One-to-four Family Loan [Member]
Principal loan balance	133,409	133,480
Deferred loan origination fees and costs, net	114	121
Amortized cost basis in loans	133,523	133,601
Residential Portfolio Segment [Member] | Multifamily [Member]
Principal loan balance	43,616	39,963
Deferred loan origination fees and costs, net	(16)	(17)
Amortized cost basis in loans	43,600	39,946
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]
Principal loan balance	59,774	62,070
Deferred loan origination fees and costs, net	1,218	1,231
Amortized cost basis in loans	60,992	63,301
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]
Principal loan balance	55,020	56,373
Deferred loan origination fees and costs, net	0	0
Amortized cost basis in loans	55,020	56,373
Construction [Member] | One-to-four Family Residential Construction [Member]
Principal loan balance	15,920	15,667
Deferred loan origination fees and costs, net	0	0
Amortized cost basis in loans	15,920	15,667
Construction [Member] | Other Construction, Development and Land [Member]
Principal loan balance	78,116	76,713
Deferred loan origination fees and costs, net	(37)	(44)
Amortized cost basis in loans	78,079	76,669
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Loan [Member]
Principal loan balance	174,956	168,757
Deferred loan origination fees and costs, net	(139)	(112)
Amortized cost basis in loans	174,817	168,645
Commercial Portfolio Segment [Member] | Commercial Business [Member]
Principal loan balance	67,666	68,223
Deferred loan origination fees and costs, net	(10)	(11)
Amortized cost basis in loans	$ 67,656	$ 68,212