Note 3 - Loans Receivable - Credit Quality Indicators by Class of Loan (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Total loans	$ 1,357,161	$ 1,154,033
Nonperforming Financial Instruments [Member]
Total loans	1,381	2,273
Performing Financial Instruments [Member]
Total loans	1,355,780	1,151,760
Pass [Member]
Total loans	1,286,542	1,064,546
Watch [Member]
Total loans	45,717	57,981
Special Mention [Member]
Total loans	12,305	23,978
Substandard [Member]
Total loans	12,597	7,528
Real Estate Portfolio Segment [Member]
Total loans	1,055,382	892,496
Real Estate Portfolio Segment [Member] | Pass [Member]
Total loans	986,831	815,921
Real Estate Portfolio Segment [Member] | Watch [Member]
Total loans	44,577	47,807
Real Estate Portfolio Segment [Member] | Special Mention [Member]
Total loans	12,240	22,494
Real Estate Portfolio Segment [Member] | Substandard [Member]
Total loans	11,734	6,274
Real Estate Portfolio Segment [Member] | One-to-four Family Loan [Member]
Total loans	294,965	309,828
Real Estate Portfolio Segment [Member] | One-to-four Family Loan [Member] | Nonperforming Financial Instruments [Member]
Total loans	494	912
Real Estate Portfolio Segment [Member] | One-to-four Family Loan [Member] | Performing Financial Instruments [Member]
Total loans	294,471	308,916
Real Estate Portfolio Segment [Member] | One-to-four Family Loan [Member] | Pass [Member]
Total loans	291,421	303,840
Real Estate Portfolio Segment [Member] | One-to-four Family Loan [Member] | Watch [Member]
Total loans	2,727	2,487
Real Estate Portfolio Segment [Member] | One-to-four Family Loan [Member] | Special Mention [Member]
Total loans	53	1,730
Real Estate Portfolio Segment [Member] | One-to-four Family Loan [Member] | Substandard [Member]
Total loans	764	1,771
Real Estate Portfolio Segment [Member] | Multi-family Loan [Member]
Total loans	172,409	162,467
Real Estate Portfolio Segment [Member] | Multi-family Loan [Member] | Nonperforming Financial Instruments [Member]
Total loans	0	284
Real Estate Portfolio Segment [Member] | Multi-family Loan [Member] | Performing Financial Instruments [Member]
Total loans	172,409	162,183
Real Estate Portfolio Segment [Member] | Multi-family Loan [Member] | Pass [Member]
Total loans	153,704	146,536
Real Estate Portfolio Segment [Member] | Multi-family Loan [Member] | Watch [Member]
Total loans	18,705	15,647
Real Estate Portfolio Segment [Member] | Multi-family Loan [Member] | Special Mention [Member]
Total loans	0	0
Real Estate Portfolio Segment [Member] | Multi-family Loan [Member] | Substandard [Member]
Total loans	0	284
Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member]
Total loans	363,299	296,574
Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member] | Nonperforming Financial Instruments [Member]
Total loans	71	157
Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member] | Performing Financial Instruments [Member]
Total loans	363,228	296,417
Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member] | Pass [Member]
Total loans	326,444	250,970
Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member] | Watch [Member]
Total loans	22,850	20,759
Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member] | Special Mention [Member]
Total loans	3,057	20,690
Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member] | Substandard [Member]
Total loans	10,948	4,155
Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Total loans	224,709	123,627
Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Nonperforming Financial Instruments [Member]
Total loans	22	26
Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Performing Financial Instruments [Member]
Total loans	224,687	123,601
Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Pass [Member]
Total loans	215,262	114,575
Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Watch [Member]
Total loans	295	8,914
Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Special Mention [Member]
Total loans	9,130	74
Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Substandard [Member]
Total loans	22	64
Consumer Portfolio Segment [Member]
Total loans	221,941	161,336
Consumer Portfolio Segment [Member] | Pass [Member]
Total loans	220,095	156,615
Consumer Portfolio Segment [Member] | Watch [Member]
Total loans	918	2,383
Consumer Portfolio Segment [Member] | Special Mention [Member]
Total loans	65	1,316
Consumer Portfolio Segment [Member] | Substandard [Member]
Total loans	863	1,022
Consumer Portfolio Segment [Member] | Home Equity Loan [Member]
Total loans	39,172	33,103
Consumer Portfolio Segment [Member] | Home Equity Loan [Member] | Nonperforming Financial Instruments [Member]
Total loans	282	73
Consumer Portfolio Segment [Member] | Home Equity Loan [Member] | Performing Financial Instruments [Member]
Total loans	38,890	33,030
Consumer Portfolio Segment [Member] | Home Equity Loan [Member] | Pass [Member]
Total loans	38,739	32,500
Consumer Portfolio Segment [Member] | Home Equity Loan [Member] | Watch [Member]
Total loans	83	349
Consumer Portfolio Segment [Member] | Home Equity Loan [Member] | Special Mention [Member]
Total loans	0	100
Consumer Portfolio Segment [Member] | Home Equity Loan [Member] | Substandard [Member]
Total loans	350	154
Consumer Portfolio Segment [Member] | Automobile and Other Loan [Member]
Total loans	182,769	128,233
Consumer Portfolio Segment [Member] | Automobile and Other Loan [Member] | Nonperforming Financial Instruments [Member]
Total loans	512	821
Consumer Portfolio Segment [Member] | Automobile and Other Loan [Member] | Performing Financial Instruments [Member]
Total loans	182,257	127,412
Consumer Portfolio Segment [Member] | Automobile and Other Loan [Member] | Pass [Member]
Total loans	181,356	124,115
Consumer Portfolio Segment [Member] | Automobile and Other Loan [Member] | Watch [Member]
Total loans	835	2,034
Consumer Portfolio Segment [Member] | Automobile and Other Loan [Member] | Special Mention [Member]
Total loans	65	1,216
Consumer Portfolio Segment [Member] | Automobile and Other Loan [Member] | Substandard [Member]
Total loans	513	868
Commercial Portfolio Segment [Member]
Total loans	79,838	100,201
Commercial Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Total loans	0	0
Commercial Portfolio Segment [Member] | Performing Financial Instruments [Member]
Total loans	79,838	100,201
Commercial Portfolio Segment [Member] | Pass [Member]
Total loans	79,616	92,010
Commercial Portfolio Segment [Member] | Watch [Member]
Total loans	222	7,791
Commercial Portfolio Segment [Member] | Special Mention [Member]
Total loans	0	168
Commercial Portfolio Segment [Member] | Substandard [Member]
Total loans	$ 0	$ 232