Note 4 - Allowance for Credit Losses on Loans - Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended			12 Months Ended
	Sep. 30, 2024		Sep. 30, 2023	Sep. 30, 2024		Sep. 30, 2023	Dec. 31, 2023
Balance			$ 17,297	$ 17,510	[1]	$ 16,116	$ 16,116
Write-offs	$ (516)			(8,808)		(2,668)	(3,322)
Recoveries	66					93
Provision for credit losses	3,077		880	12,956		1,195
Balance	21,970	[1]	16,945	21,970	[1]	16,945	17,510	[1]
Recoveries	(66)					(93)
Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Balance	19,343					18,325	18,325
Recoveries			(501)	312
Recoveries			501	(312)
Cumulative Effect, Period of Adoption, Adjustment [Member]
Balance						2,209	2,209
Write-offs			(731)	(8,808)
Real Estate Portfolio Segment [Member] | One-to-four Family Loan [Member]
Balance			3,012	2,975		3,343	3,343
Write-offs	0			0		0	0
Recoveries	42					4
Provision for credit losses	(270)		526	1,289		620
Balance	4,308		3,538	4,308		3,538	2,975
Recoveries	(42)					(4)
Real Estate Portfolio Segment [Member] | One-to-four Family Loan [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Balance	4,536					2,914	2,914
Recoveries			0	44
Recoveries			0	(44)
Real Estate Portfolio Segment [Member] | One-to-four Family Loan [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Balance						(429)	(429)
Write-offs			0	0
Real Estate Portfolio Segment [Member] | Multi-family Loan [Member]
Balance			1,041	1,154		2,468	2,468
Write-offs	0			0		0	0
Recoveries	0					0
Provision for credit losses	965		230	1,435		252
Balance	2,589		1,271	2,589		1,271	1,154
Recoveries	0					0
Real Estate Portfolio Segment [Member] | Multi-family Loan [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Balance	1,624					1,019	1,019
Recoveries			0	0
Recoveries			0	0
Real Estate Portfolio Segment [Member] | Multi-family Loan [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Balance						(1,449)	(1,449)
Write-offs			0	0
Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member]
Balance			2,924	3,671		4,217	4,217
Write-offs	0			0		0	0
Recoveries	0					0
Provision for credit losses	(495)		(390)	(1,034)		(1,079)
Balance	2,637		2,534	2,637		2,534	3,671
Recoveries	0					0
Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Balance	3,132					3,613	3,613
Recoveries			0	0
Recoveries			0	0
Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Balance						(604)	(604)
Write-offs			0	0
Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Balance			2,535	1,889		2,344	2,344
Write-offs	0			(3,978)		0	0
Recoveries	0					0
Provision for credit losses	(85)		(352)	2,805		(1,716)
Balance	716		2,183	716		2,183	1,889
Recoveries	0					0
Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Balance	801					3,899	3,899
Recoveries			0	0
Recoveries			0	0
Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Balance						1,555	1,555
Write-offs			0	(3,978)
Consumer Portfolio Segment [Member] | Home Equity Loan [Member]
Balance			1,125	1,077		549	549
Write-offs	0			0		(11)	(10)
Recoveries	0					5
Provision for credit losses	(446)		178	169		414
Balance	1,246		1,303	1,246		1,303	1,077
Recoveries	0					(5)
Consumer Portfolio Segment [Member] | Home Equity Loan [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Balance	1,692					895	895
Recoveries			0	0
Recoveries			0	0
Consumer Portfolio Segment [Member] | Home Equity Loan [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Balance						346	346
Write-offs			0	0
Consumer Portfolio Segment [Member] | Automobile and Other Loan [Member]
Balance			4,795	4,409		2,024	2,024
Write-offs	(492)					(2,657)
Recoveries	24					84
Provision for credit losses	805		601	386		2,332
Balance	2,933		4,164	2,933		4,164	4,409
Recoveries	(24)					(84)
Consumer Portfolio Segment [Member] | Automobile and Other Loan [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Balance	2,596					4,405	4,405
Recoveries			(501)	268
Recoveries			501	(268)
Consumer Portfolio Segment [Member] | Automobile and Other Loan [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Balance						2,381	2,381
Write-offs			(731)	(2,130)
Commercial Portfolio Segment [Member]
Balance			1,865	2,335		786	786
Write-offs	(24)			(2,700)		0	0
Recoveries	0					0
Provision for credit losses	2,603		87	7,906		372
Balance	7,541		1,952	7,541		1,952	2,335
Recoveries	0					0
Commercial Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Balance	$ 4,962					1,580	1,580
Recoveries			0	0
Recoveries			0	0
Commercial Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Balance						794	794
Write-offs			0	$ (2,700)
Unallocated Financing Receivables [Member]
Balance						385	385
Write-offs						0
Recoveries						0
Provision for credit losses						0
Balance			$ 0			0
Recoveries						0
Unallocated Financing Receivables [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Balance						0	0
Unallocated Financing Receivables [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Balance						$ (385)	$ (385)

[1] Allowance for credit losses on loans in 2023 reported using the CECL method and in 2022 reported using the incurred loss method.