Note 3 - Loans Receivable - Nonaccrual Loans by Class (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Total nonaccrual loans	$ 1,381	$ 2,273
Real Estate Portfolio Segment [Member] | One-to-four Family Loan [Member]
Total nonaccrual loans	494	912
Real Estate Portfolio Segment [Member] | Multi-family Loan [Member]
Total nonaccrual loans	0	284
Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member]
Total nonaccrual loans	71	157
Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Total nonaccrual loans	22	26
Consumer Portfolio Segment [Member] | Home Equity Loan [Member]
Total nonaccrual loans	282	73
Consumer Portfolio Segment [Member] | Automobile and Other Loan [Member]
Total nonaccrual loans	$ 512	$ 821