Note 3 - Loans Receivable - Analysis of Past Due Loans (Details) - USD ($) $ in Thousands		Sep. 30, 2022	Dec. 31, 2021
Loans receivable		$ 1,354,465	$ 1,205,785
Financial Asset, 1 to 59 Days Past Due [Member]
Loans receivable	[1]	2,572	643
Financial Asset, 60 to 89 Days Past Due [Member]
Loans receivable	[2]	359	2,051
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans receivable		3,596	4,368
Financial Asset, Past Due [Member]
Loans receivable		6,527	7,062
Financial Asset, Not Past Due [Member]
Loans receivable	[3]	1,347,938	1,198,723
Residential Portfolio Segment [Member] | One to Four Family [Member]
Loans receivable		361,943	300,523
Residential Portfolio Segment [Member] | One to Four Family [Member] | Financial Asset, 1 to 59 Days Past Due [Member]
Loans receivable	[1]	2,035	622
Residential Portfolio Segment [Member] | One to Four Family [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans receivable	[2]	245	2,028
Residential Portfolio Segment [Member] | One to Four Family [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans receivable		3,573	4,214
Residential Portfolio Segment [Member] | One to Four Family [Member] | Financial Asset, Past Due [Member]
Loans receivable		5,853	6,864
Residential Portfolio Segment [Member] | One to Four Family [Member] | Financial Asset, Not Past Due [Member]
Loans receivable	[3]	356,090	293,659
Residential Portfolio Segment [Member] | Multifamily [Member]
Loans receivable		621,560	537,956
Residential Portfolio Segment [Member] | Multifamily [Member] | Financial Asset, 1 to 59 Days Past Due [Member]
Loans receivable	[1]	0	0
Residential Portfolio Segment [Member] | Multifamily [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans receivable	[2]	0	0
Residential Portfolio Segment [Member] | Multifamily [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans receivable		0	128
Residential Portfolio Segment [Member] | Multifamily [Member] | Financial Asset, Past Due [Member]
Loans receivable		0	128
Residential Portfolio Segment [Member] | Multifamily [Member] | Financial Asset, Not Past Due [Member]
Loans receivable	[3]	621,560	537,828
Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Loans receivable		11,020	11,012
Residential Portfolio Segment [Member] | Home Equity Loan [Member] | Financial Asset, 1 to 59 Days Past Due [Member]
Loans receivable	[1]	180	14
Residential Portfolio Segment [Member] | Home Equity Loan [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans receivable	[2]	18	23
Residential Portfolio Segment [Member] | Home Equity Loan [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans receivable		23	26
Residential Portfolio Segment [Member] | Home Equity Loan [Member] | Financial Asset, Past Due [Member]
Loans receivable		221	63
Residential Portfolio Segment [Member] | Home Equity Loan [Member] | Financial Asset, Not Past Due [Member]
Loans receivable	[3]	10,799	10,949
Construction and Land Portfolio Segment [Member]
Loans receivable		61,125	82,588
Construction and Land Portfolio Segment [Member] | Financial Asset, 1 to 59 Days Past Due [Member]
Loans receivable	[1]	0	0
Construction and Land Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans receivable	[2]	0	0
Construction and Land Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans receivable		0	0
Construction and Land Portfolio Segment [Member] | Financial Asset, Past Due [Member]
Loans receivable		0	0
Construction and Land Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Loans receivable	[3]	61,125	82,588
Commercial Real Estate Portfolio Segment [Member]
Loans receivable		278,864	250,676
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 1 to 59 Days Past Due [Member]
Loans receivable	[1]	0	0
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans receivable	[2]	96	0
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans receivable		0	0
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Past Due [Member]
Loans receivable		96	0
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Loans receivable	[3]	278,768	250,676
Consumer Portfolio Segment [Member]
Loans receivable		757	732
Consumer Portfolio Segment [Member] | Financial Asset, 1 to 59 Days Past Due [Member]
Loans receivable	[1]	0	0
Consumer Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans receivable	[2]	0	0
Consumer Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans receivable		0	0
Consumer Portfolio Segment [Member] | Financial Asset, Past Due [Member]
Loans receivable		0	0
Consumer Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Loans receivable	[3]	757	732
Commercial Portfolio Segment [Member]
Loans receivable		19,196	22,298
Commercial Portfolio Segment [Member] | Financial Asset, 1 to 59 Days Past Due [Member]
Loans receivable	[1]	357	7
Commercial Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans receivable	[2]	0	0
Commercial Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans receivable		0	0
Commercial Portfolio Segment [Member] | Financial Asset, Past Due [Member]
Loans receivable		357	7
Commercial Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Loans receivable	[3]	$ 18,839	$ 22,291

[1] Includes $600,000 and $43,000 at March 31, 2022 and December 31, 2021, respectively, which are on non-accrual status.

[2] Includes $ - and $347,000 at March 31, 2022 and December 31, 2021, respectively, which are on non-accrual status.

[3] Includes $666,000 and $816,000 at March 31, 2022 and December 31, 2021, respectively, which are on non-accrual status.