Note 3 - Loans Receivable - Past Due Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Loans receivable, gross	$ 1,465,277	$ 1,357,161
Financial Asset, 30 to 59 Days Past Due [Member]
Loans receivable, gross	1,515	1,638
Financial Asset, 60 to 89 Days Past Due [Member]
Loans receivable, gross	1,893	369
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans receivable, gross	213	99
Financial Asset, Past Due [Member]
Loans receivable, gross	3,621	2,106
Financial Asset, Not Past Due [Member]
Loans receivable, gross	1,461,656	1,355,055
Real Estate Portfolio Segment [Member]
Loans receivable, gross	1,126,201	1,055,382
Real Estate Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans receivable, gross	340	1,079
Real Estate Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans receivable, gross	1,751	0
Real Estate Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans receivable, gross	173	0
Real Estate Portfolio Segment [Member] | Financial Asset, Past Due [Member]
Loans receivable, gross	2,264	1,079
Real Estate Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Loans receivable, gross	1,123,937	1,054,303
Real Estate Portfolio Segment [Member] | One-to-four Family Loan [Member]
Loans receivable, gross	309,191	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	340	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	151	0
Real Estate Portfolio Segment [Member] | One-to-four Family Loan [Member] | Financial Asset, Past Due [Member]
Loans receivable, gross	491	786
Real Estate Portfolio Segment [Member] | One-to-four Family Loan [Member] | Financial Asset, Not Past Due [Member]
Loans receivable, gross	308,700	294,179
Real Estate Portfolio Segment [Member] | Multi-family Loan [Member]
Loans receivable, gross	221,337	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	221,337	172,409
Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member]
Loans receivable, gross	381,279	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	381,279	363,299
Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Loans receivable, gross	214,394	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	1,751	0
Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans receivable, gross	22	0
Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Financial Asset, Past Due [Member]
Loans receivable, gross	1,773	293
Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Financial Asset, Not Past Due [Member]
Loans receivable, gross	212,621	224,416
Consumer Portfolio Segment [Member]
Loans receivable, gross	267,858	221,941
Consumer Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans receivable, gross	1,175	552
Consumer Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans receivable, gross	142	369
Consumer Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans receivable, gross	40	99
Consumer Portfolio Segment [Member] | Financial Asset, Past Due [Member]
Loans receivable, gross	1,357	1,020
Consumer Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Loans receivable, gross	266,501	220,921
Consumer Portfolio Segment [Member] | Home Equity Loan [Member]
Loans receivable, gross	46,993	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	27	0
Consumer Portfolio Segment [Member] | Home Equity Loan [Member] | Financial Asset, Past Due [Member]
Loans receivable, gross	27	83
Consumer Portfolio Segment [Member] | Home Equity Loan [Member] | Financial Asset, Not Past Due [Member]
Loans receivable, gross	46,966	39,089
Consumer Portfolio Segment [Member] | Automobile and Other Loan [Member]
Loans receivable, gross	220,865	182,769
Consumer Portfolio Segment [Member] | Automobile and Other Loan [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans receivable, gross	1,175	469
Consumer Portfolio Segment [Member] | Automobile and Other Loan [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans receivable, gross	142	369
Consumer Portfolio Segment [Member] | Automobile and Other Loan [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans receivable, gross	13	99
Consumer Portfolio Segment [Member] | Automobile and Other Loan [Member] | Financial Asset, Past Due [Member]
Loans receivable, gross	1,330	937
Consumer Portfolio Segment [Member] | Automobile and Other Loan [Member] | Financial Asset, Not Past Due [Member]
Loans receivable, gross	219,535	181,832
Commercial Portfolio Segment [Member]
Loans receivable, gross	71,218	79,838
Commercial Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans receivable, gross	0	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	0	7
Commercial Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Loans receivable, gross	$ 71,218	$ 79,831