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Note 4 - Loans Receivable - Loans Receivable (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021
Loans receivable	$ 1,179,993		$ 1,234,872
Allowance for credit losses	(9,226)	$ (10,032)	(8,129)	$ (7,202)	$ (6,786)	$ (6,715)
Loans, net	1,170,767		1,226,743
Commercial Portfolio Segment [Member]
Loans receivable	495,520		553,056
Allowance for credit losses	(2,943)	(3,576)	(2,548)	(2,149)	(2,078)	(1,652)
Consumer Portfolio Segment [Member]
Loans receivable	1,355		1,584
Allowance for credit losses	(33)	(41)	(49)	(42)	(46)	(44)
One-to-Four Family Residential Real Estate [Member] | Real Estate Portfolio [Member]
Loans receivable	20,448		23,133
Allowance for credit losses	(326)	(354)	(281)	(286)	(315)	(331)
Multi-family Mortgage [Member] | Real Estate Portfolio [Member]
Loans receivable	542,165		537,394
Allowance for credit losses	(4,679)	(4,714)	(4,017)	(3,632)	(3,390)	(3,377)
Nonresidential Real Estate [Member] | Real Estate Portfolio [Member]
Loans receivable	120,505		119,705
Allowance for credit losses	$ (1,245)	$ (1,347)	$ (1,234)	$ (1,093)	$ (957)	$ (1,311)

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-SubTopic 10
-Name Accounting Standards Codification
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X

- Definition

Amortized cost, before allowance for credit loss, fee, and loan in process, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease.

+ References

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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