Note 3 - Loans Receivable - Troubled Debt Restructurings (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Total TDR loans	$ 1,771	$ 1,843
Total nonaccrual TDR loans	29	29
Total accrual TDR loans	1,742
Troubled Debt Restructurings [Member]
Allowance for loan losses related to TDR loans	18	$ 21
One-to-four Family Loan [Member] \| Real Estate Portfolio Segment [Member]
Total TDR loans	1,743
Total nonaccrual TDR loans	29
Total accrual TDR loans	1,714
Home Equity Loan [Member] \| Consumer Portfolio Segment [Member]
Total TDR loans	28
Total nonaccrual TDR loans	0
Total accrual TDR loans	$ 28

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant