Note 3 - Loans Receivable - Loans Receivable (Details) - USD ($) $ in Thousands	Sep. 30, 2024		Dec. 31, 2023		Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
Loan receivable, gross	$ 1,734,807		$ 1,660,028
Derivative basis adjustment	(1,579)		0
Loans receivable, allowance for credit losses	21,970	[1]	17,510	[1]	$ 16,945	$ 17,297	$ 16,116
Total loans receivable, net	1,714,416		1,642,518
Real Estate Portfolio Segment [Member]
Loan receivable, gross	1,221,322		1,229,200
Real Estate Portfolio Segment [Member] | One-to-four Family Loan [Member]
Loan receivable, gross	395,792		378,432
Loans receivable, allowance for credit losses	4,308		2,975		3,538	3,012	3,343
Real Estate Portfolio Segment [Member] | Multi-family Loan [Member]
Loan receivable, gross	353,813		333,094
Loans receivable, allowance for credit losses	2,589		1,154		1,271	1,041	2,468
Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member]
Loan receivable, gross	376,008		387,983
Loans receivable, allowance for credit losses	2,637		3,671		2,534	2,924	4,217
Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Loan receivable, gross	95,709		129,691
Loans receivable, allowance for credit losses	716		1,889		2,183	2,535	2,344
Consumer Portfolio Segment [Member]
Loan receivable, gross	358,158		318,533
Consumer Portfolio Segment [Member] | Home Equity Loan [Member]
Loan receivable, gross	76,960		69,403
Loans receivable, allowance for credit losses	1,246		1,077		1,303	1,125	549
Consumer Portfolio Segment [Member] | Automobile and Other Loan [Member]
Loan receivable, gross	281,198		249,130
Loans receivable, allowance for credit losses	2,933		4,409		4,164	4,795	2,024
Commercial Portfolio Segment [Member]
Loan receivable, gross	155,327		112,295
Loans receivable, allowance for credit losses	$ 7,541		$ 2,335		$ 1,952	$ 1,865	$ 786

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