Note 3 - Loans Receivable - Past Due Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Loans receivable, gross	$ 1,525,205	$ 1,357,161
Financial Asset, 30 to 59 Days Past Due [Member]
Loans receivable, gross	3,047	1,638
Financial Asset, 60 to 89 Days Past Due [Member]
Loans receivable, gross	366	368
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans receivable, gross	2,527	99
Financial Asset, Past Due [Member]
Loans receivable, gross	5,940	2,105
Financial Asset, Not Past Due [Member]
Loans receivable, gross	1,519,265	1,355,056
Real Estate Portfolio Segment [Member]
Loans receivable, gross	1,180,770	1,055,382
Real Estate Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans receivable, gross	1,529	1,079
Real Estate Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans receivable, gross	0	0
Real Estate Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans receivable, gross	2,373	0
Real Estate Portfolio Segment [Member] | Financial Asset, Past Due [Member]
Loans receivable, gross	3,902	1,079
Real Estate Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Loans receivable, gross	1,176,868	1,054,303
Real Estate Portfolio Segment [Member] | One-to-four Family Loan [Member]
Loans receivable, gross	335,067	294,965
Real Estate Portfolio Segment [Member] | One-to-four Family Loan [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans receivable, gross	1,529	786
Real Estate Portfolio Segment [Member] | One-to-four Family Loan [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans receivable, gross	0	0
Real Estate Portfolio Segment [Member] | One-to-four Family Loan [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans receivable, gross	623	0
Real Estate Portfolio Segment [Member] | One-to-four Family Loan [Member] | Financial Asset, Past Due [Member]
Loans receivable, gross	2,152	786
Real Estate Portfolio Segment [Member] | One-to-four Family Loan [Member] | Financial Asset, Not Past Due [Member]
Loans receivable, gross	332,915	294,179
Real Estate Portfolio Segment [Member] | Multi-family Loan [Member]
Loans receivable, gross	243,256	172,409
Real Estate Portfolio Segment [Member] | Multi-family Loan [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans receivable, gross	0	0
Real Estate Portfolio Segment [Member] | Multi-family Loan [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans 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]
Loans receivable, gross	0	0
Real Estate Portfolio Segment [Member] | Multi-family Loan [Member] | Financial Asset, Past Due [Member]
Loans receivable, gross	0	0
Real Estate Portfolio Segment [Member] | Multi-family Loan [Member] | Financial Asset, Not Past Due [Member]
Loans receivable, gross	243,256	172,409
Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member]
Loans receivable, gross	385,272	363,299
Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans receivable, gross	0	0
Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans 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]
Loans receivable, gross	0	0
Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member] | Financial Asset, Past Due [Member]
Loans receivable, gross	0	0
Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member] | Financial Asset, Not Past Due [Member]
Loans receivable, gross	385,272	363,299
Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Loans receivable, gross	217,175	224,709
Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans receivable, gross	0	293
Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans receivable, gross	0	0
Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans receivable, gross	1,750	0
Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Financial Asset, Past Due [Member]
Loans receivable, gross	1,750	293
Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Financial Asset, Not Past Due [Member]
Loans receivable, gross	215,425	224,416
Consumer Portfolio Segment [Member]
Loans receivable, gross	273,166	221,941
Consumer Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans receivable, gross	1,514	552
Consumer Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans receivable, gross	366	368
Consumer Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans receivable, gross	154	99
Consumer Portfolio Segment [Member] | Financial Asset, Past Due [Member]
Loans receivable, gross	2,034	1,019
Consumer Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Loans receivable, gross	271,132	220,922
Consumer Portfolio Segment [Member] | Home Equity Loan [Member]
Loans receivable, gross	50,066	39,172
Consumer Portfolio Segment [Member] | Home Equity Loan [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans receivable, gross	0	83
Consumer Portfolio Segment [Member] | Home Equity Loan [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans receivable, gross	0	0
Consumer Portfolio Segment [Member] | Home Equity Loan [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans receivable, gross	0	0
Consumer Portfolio Segment [Member] | Home Equity Loan [Member] | Financial Asset, Past Due [Member]
Loans receivable, gross	0	83
Consumer Portfolio Segment [Member] | Home Equity Loan [Member] | Financial Asset, Not Past Due [Member]
Loans receivable, gross	50,066	39,089
Consumer Portfolio Segment [Member] | Automobile and Other Loan [Member]
Loans receivable, gross	223,100	182,769
Consumer Portfolio Segment [Member] | Automobile and Other Loan [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans receivable, gross	1,514	469
Consumer Portfolio Segment [Member] | Automobile and Other Loan [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans receivable, gross	366	368
Consumer Portfolio Segment [Member] | Automobile and Other Loan [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans receivable, gross	154	99
Consumer Portfolio Segment [Member] | Automobile and Other Loan [Member] | Financial Asset, Past Due [Member]
Loans receivable, gross	2,034	936
Consumer Portfolio Segment [Member] | Automobile and Other Loan [Member] | Financial Asset, Not Past Due [Member]
Loans receivable, gross	221,066	181,833
Commercial Portfolio Segment [Member]
Loans receivable, gross	71,269	79,838
Commercial Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans receivable, gross	4	7
Commercial Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans receivable, gross	0	0
Commercial Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans receivable, gross	0	0
Commercial Portfolio Segment [Member] | Financial Asset, Past Due [Member]
Loans receivable, gross	4	7
Commercial Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Loans receivable, gross	$ 71,265	$ 79,831