Note 3 - Loans Receivable - Past Due Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Loan receivable, gross	$ 1,634,978	$ 1,547,551
Financial Asset, 30 to 59 Days Past Due [Member]
Loan receivable, gross	10,885	2,992
Financial Asset, 60 to 89 Days Past Due [Member]
Loan receivable, gross	1,046	871
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loan receivable, gross	1,017	1,220
Financial Asset, Past Due [Member]
Loan receivable, gross	12,948	5,083
Financial Asset, Not Past Due [Member]
Loan receivable, gross	1,622,030	1,542,468
Real Estate Portfolio Segment [Member]
Loan receivable, gross	1,220,388	1,178,834
Real Estate Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loan receivable, gross	8,583	1,449
Real Estate Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loan receivable, gross	654	173
Real Estate Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loan receivable, gross	591	652
Real Estate Portfolio Segment [Member] | Financial Asset, Past Due [Member]
Loan receivable, gross	9,828	2,274
Real Estate Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Loan receivable, gross	1,210,560	1,176,560
Real Estate Portfolio Segment [Member] | One-to-four Family Loan [Member]
Loan receivable, gross	369,950	343,559
Real Estate Portfolio Segment [Member] | One-to-four Family Loan [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loan receivable, gross	0	1,449
Real Estate Portfolio Segment [Member] | One-to-four Family Loan [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loan receivable, gross	654	155
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	591	652
Real Estate Portfolio Segment [Member] | One-to-four Family Loan [Member] | Financial Asset, Past Due [Member]
Loan receivable, gross	1,245	2,256
Real Estate Portfolio Segment [Member] | One-to-four Family Loan [Member] | Financial Asset, Not Past Due [Member]
Loan receivable, gross	368,705	341,303
Real Estate Portfolio Segment [Member] | Multi-family Loan [Member]
Loan receivable, gross	325,496	252,745
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	325,496	252,745
Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member]
Loan receivable, gross	381,508	388,884
Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loan receivable, gross	8,583	0
Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loan receivable, gross	0	0
Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loan receivable, gross	0	0
Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member] | Financial Asset, Past Due [Member]
Loan receivable, gross	8,583	0
Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member] | Financial Asset, Not Past Due [Member]
Loan receivable, gross	372,925	388,884
Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Loan receivable, gross	143,434	193,646
Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loan receivable, gross	0	0
Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loan receivable, gross	0	18
Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loan receivable, gross	0	0
Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Financial Asset, Past Due [Member]
Loan receivable, gross	0	18
Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Financial Asset, Not Past Due [Member]
Loan receivable, gross	143,434	193,628
Consumer Portfolio Segment [Member]
Loan receivable, gross	313,210	291,790
Consumer Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loan receivable, gross	1,533	1,543
Consumer Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loan receivable, gross	392	698
Consumer Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loan receivable, gross	426	568
Consumer Portfolio Segment [Member] | Financial Asset, Past Due [Member]
Loan receivable, gross	2,351	2,809
Consumer Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Loan receivable, gross	310,859	288,981
Consumer Portfolio Segment [Member] | Home Equity Loan [Member]
Loan receivable, gross	64,424	52,877
Consumer Portfolio Segment [Member] | Home Equity Loan [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loan receivable, gross	71	153
Consumer Portfolio Segment [Member] | Home Equity Loan [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loan receivable, gross	0	0
Consumer Portfolio Segment [Member] | Home Equity Loan [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loan receivable, gross	45	11
Consumer Portfolio Segment [Member] | Home Equity Loan [Member] | Financial Asset, Past Due [Member]
Loan receivable, gross	116	164
Consumer Portfolio Segment [Member] | Home Equity Loan [Member] | Financial Asset, Not Past Due [Member]
Loan receivable, gross	64,308	52,713
Consumer Portfolio Segment [Member] | Automobile and Other Loan [Member]
Loan receivable, gross	248,786	238,913
Consumer Portfolio Segment [Member] | Automobile and Other Loan [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loan receivable, gross	1,462	1,390
Consumer Portfolio Segment [Member] | Automobile and Other Loan [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loan receivable, gross	392	698
Consumer Portfolio Segment [Member] | Automobile and Other Loan [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loan receivable, gross	381	557
Consumer Portfolio Segment [Member] | Automobile and Other Loan [Member] | Financial Asset, Past Due [Member]
Loan receivable, gross	2,235	2,645
Consumer Portfolio Segment [Member] | Automobile and Other Loan [Member] | Financial Asset, Not Past Due [Member]
Loan receivable, gross	246,551	236,268
Commercial Portfolio Segment [Member]
Loan receivable, gross	101,380	76,927
Commercial Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loan receivable, gross	769	0
Commercial Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loan receivable, gross	0	0
Commercial Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loan receivable, gross	0	0
Commercial Portfolio Segment [Member] | Financial Asset, Past Due [Member]
Loan receivable, gross	769	0
Commercial Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Loan receivable, gross	$ 100,611	$ 76,927