Note 3 - Loans Receivable - Past Due Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Loan receivable, gross	$ 1,734,807	$ 1,660,028
Financial Asset, 30 to 59 Days Past Due [Member]
Loan receivable, gross	3,781	3,846
Financial Asset, 60 to 89 Days Past Due [Member]
Loan receivable, gross	9,637	9,884
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loan receivable, gross	19,324	1,801
Financial Asset, Past Due [Member]
Loan receivable, gross	32,742	15,531
Financial Asset, Not Past Due [Member]
Loan receivable, gross	1,702,065	1,644,497
Real Estate Portfolio Segment [Member]
Loan receivable, gross	1,221,322	1,229,200
Real Estate Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loan receivable, gross	0	816
Real Estate Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loan receivable, gross	8,532	8,526
Real Estate Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loan receivable, gross	17,825	1,010
Real Estate Portfolio Segment [Member] | Financial Asset, Past Due [Member]
Loan receivable, gross	26,357	10,352
Real Estate Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Loan receivable, gross	1,194,965	1,218,848
Real Estate Portfolio Segment [Member] | One-to-four Family Loan [Member]
Loan receivable, gross	395,792	378,432
Real Estate Portfolio Segment [Member] | One-to-four Family Loan [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loan receivable, gross	0	802
Real Estate Portfolio Segment [Member] | One-to-four Family Loan [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loan receivable, gross	360	0
Real Estate Portfolio Segment [Member] | One-to-four Family Loan [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loan receivable, gross	1,003	1,010
Real Estate Portfolio Segment [Member] | One-to-four Family Loan [Member] | Financial Asset, Past Due [Member]
Loan receivable, gross	1,363	1,812
Real Estate Portfolio Segment [Member] | One-to-four Family Loan [Member] | Financial Asset, Not Past Due [Member]
Loan receivable, gross	394,429	376,620
Real Estate Portfolio Segment [Member] | Multi-family Loan [Member]
Loan receivable, gross	353,813	333,094
Real Estate Portfolio Segment [Member] | Multi-family Loan [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loan receivable, gross	0	0
Real Estate Portfolio Segment [Member] | Multi-family Loan [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loan receivable, gross	0	0
Real Estate Portfolio Segment [Member] | Multi-family Loan [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loan receivable, gross	0	0
Real Estate Portfolio Segment [Member] | Multi-family Loan [Member] | Financial Asset, Past Due [Member]
Loan receivable, gross	0	0
Real Estate Portfolio Segment [Member] | Multi-family Loan [Member] | Financial Asset, Not Past Due [Member]
Loan receivable, gross	353,813	333,094
Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member]
Loan receivable, gross	376,008	387,983
Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loan receivable, gross	0	0
Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loan receivable, gross	0	8,526
Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loan receivable, gross	5,624	0
Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member] | Financial Asset, Past Due [Member]
Loan receivable, gross	5,624	8,526
Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member] | Financial Asset, Not Past Due [Member]
Loan receivable, gross	370,384	379,457
Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Loan receivable, gross	95,709	129,691
Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loan receivable, gross	0	14
Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loan receivable, gross	8,172	0
Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loan receivable, gross	11,198	0
Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Financial Asset, Past Due [Member]
Loan receivable, gross	19,370	14
Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Financial Asset, Not Past Due [Member]
Loan receivable, gross	76,339	129,677
Consumer Portfolio Segment [Member]
Loan receivable, gross	358,158	318,533
Consumer Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loan receivable, gross	2,431	1,913
Consumer Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loan receivable, gross	459	601
Consumer Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loan receivable, gross	894	791
Consumer Portfolio Segment [Member] | Financial Asset, Past Due [Member]
Loan receivable, gross	3,784	3,305
Consumer Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Loan receivable, gross	354,374	315,228
Consumer Portfolio Segment [Member] | Home Equity Loan [Member]
Loan receivable, gross	76,960	69,403
Consumer Portfolio Segment [Member] | Home Equity Loan [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loan receivable, gross	53	59
Consumer Portfolio Segment [Member] | Home Equity Loan [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loan receivable, gross	29	0
Consumer Portfolio Segment [Member] | Home Equity Loan [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loan receivable, gross	0	0
Consumer Portfolio Segment [Member] | Home Equity Loan [Member] | Financial Asset, Past Due [Member]
Loan receivable, gross	82	59
Consumer Portfolio Segment [Member] | Home Equity Loan [Member] | Financial Asset, Not Past Due [Member]
Loan receivable, gross	76,878	69,344
Consumer Portfolio Segment [Member] | Automobile and Other Loan [Member]
Loan receivable, gross	281,198	249,130
Consumer Portfolio Segment [Member] | Automobile and Other Loan [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loan receivable, gross	2,378	1,854
Consumer Portfolio Segment [Member] | Automobile and Other Loan [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loan receivable, gross	430	601
Consumer Portfolio Segment [Member] | Automobile and Other Loan [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loan receivable, gross	894	791
Consumer Portfolio Segment [Member] | Automobile and Other Loan [Member] | Financial Asset, Past Due [Member]
Loan receivable, gross	3,702	3,246
Consumer Portfolio Segment [Member] | Automobile and Other Loan [Member] | Financial Asset, Not Past Due [Member]
Loan receivable, gross	277,496	245,884
Commercial Portfolio Segment [Member]
Loan receivable, gross	155,327	112,295
Commercial Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loan receivable, gross	1,350	1,117
Commercial Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loan receivable, gross	646	757
Commercial Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loan receivable, gross	605	0
Commercial Portfolio Segment [Member] | Financial Asset, Past Due [Member]
Loan receivable, gross	2,601	1,874
Commercial Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Loan receivable, gross	$ 152,726	$ 110,421