Note 3 - Loans Receivable - Analysis of Past Due Loans (Details) - USD ($) $ in Thousands		Sep. 30, 2024	Dec. 31, 2023
Loans receivable		$ 1,695,403	$ 1,664,215
Financial Asset, 1 to 59 Days Past Due [Member]
Loans receivable	[1]	5,357	5,528
Financial Asset, 60 to 89 Days Past Due [Member]
Loans receivable	[2]	1,185	1,289
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans receivable		4,080	4,433
Financial Asset, Past Due [Member]
Loans receivable		10,622	11,250
Financial Asset, Not Past Due [Member]
Loans receivable	[3]	1,684,781	1,652,965
Residential Portfolio Segment [Member] | One to Four Family [Member]
Loans receivable		534,001	551,190
Residential Portfolio Segment [Member] | One to Four Family [Member] | Financial Asset, 1 to 59 Days Past Due [Member]
Loans receivable	[1]	5,271	5,265
Residential Portfolio Segment [Member] | One to Four Family [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans receivable	[2]	1,185	1,283
Residential Portfolio Segment [Member] | One to Four Family [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans receivable		3,920	4,270
Residential Portfolio Segment [Member] | One to Four Family [Member] | Financial Asset, Past Due [Member]
Loans receivable		10,376	10,818
Residential Portfolio Segment [Member] | One to Four Family [Member] | Financial Asset, Not Past Due [Member]
Loans receivable	[3]	523,625	540,372
Residential Portfolio Segment [Member] | Multifamily [Member]
Loans receivable		723,238	707,566
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	6
Residential Portfolio Segment [Member] | Multifamily [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans receivable		0	0
Residential Portfolio Segment [Member] | Multifamily [Member] | Financial Asset, Past Due [Member]
Loans receivable		0	6
Residential Portfolio Segment [Member] | Multifamily [Member] | Financial Asset, Not Past Due [Member]
Loans receivable	[3]	723,238	707,560
Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Loans receivable		13,427	13,228
Residential Portfolio Segment [Member] | Home Equity Loan [Member] | Financial Asset, 1 to 59 Days Past Due [Member]
Loans receivable	[1]	86	209
Residential Portfolio Segment [Member] | Home Equity Loan [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans receivable	[2]	0	0
Residential Portfolio Segment [Member] | Home Equity Loan [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans receivable		31	34
Residential Portfolio Segment [Member] | Home Equity Loan [Member] | Financial Asset, Past Due [Member]
Loans receivable		117	243
Residential Portfolio Segment [Member] | Home Equity Loan [Member] | Financial Asset, Not Past Due [Member]
Loans receivable	[3]	13,310	12,985
Construction and Land Portfolio Segment [Member]
Loans receivable		75,403	53,371
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]	75,403	53,371
Commercial Real Estate Portfolio Segment [Member]
Loans receivable		313,953	300,892
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 1 to 59 Days Past Due [Member]
Loans receivable	[1]	0	54
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans receivable	[2]	0	0
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans receivable		129	129
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Past Due [Member]
Loans receivable		129	183
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Loans receivable	[3]	313,824	300,709
Consumer Portfolio Segment [Member]
Loans receivable		897	848
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]	897	848
Commercial Portfolio Segment [Member]
Loans receivable		34,484	37,120
Commercial Portfolio Segment [Member] | Financial Asset, 1 to 59 Days Past Due [Member]
Loans receivable	[1]	0	0
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		0	0
Commercial Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Loans receivable	[3]	$ 34,484	$ 37,120

[1] Includes $667,000 and $193,000 at June 30, 2024 and December 31, 2023, respectively, which are on non-accrual status.

[2] Includes $- and $11,000 at June 30, 2024 and December 31, 2023, respectively, which are on non-accrual status.

[3] Includes $1.0 million and $171,000 at June 30, 2024 and December 31, 2023, respectively, which are on non-accrual status.