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Note 4 - Loans Receivable - Allowance for Loan Losses and Loans Receivable (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021
Loan balances, individually evaluated for impairment	$ 24,224		$ 2,712
Loan balances, collectively evaluated for impairment	1,155,769		1,232,160
Loans receivable	1,179,993		1,234,872
Allowance for loan losses, individually evaluated for impairment	0		0
Allowance for loan losses, collectively evaluated for impairment	9,226		8,129
Allowance for loan losses	9,226	$ 10,032	8,129	$ 7,202	$ 6,786	$ 6,715
Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate [Member]
Loan balances, individually evaluated for impairment	78		752
Loan balances, collectively evaluated for impairment	20,370		22,381
Loans receivable	20,448		23,133
Allowance for loan losses, individually evaluated for impairment	0		0
Allowance for loan losses, collectively evaluated for impairment	326		281
Allowance for loan losses	326	354	281	286	315	331
Real Estate Portfolio [Member] | Multi-family Mortgage [Member]
Loan balances, individually evaluated for impairment	148		473
Loan balances, collectively evaluated for impairment	542,017		536,921
Loans receivable	542,165		537,394
Allowance for loan losses, individually evaluated for impairment	0		0
Allowance for loan losses, collectively evaluated for impairment	4,679		4,017
Allowance for loan losses	4,679	4,714	4,017	3,632	3,390	3,377
Real Estate Portfolio [Member] | Nonresidential Real Estate [Member]
Loan balances, individually evaluated for impairment	0		0
Loan balances, collectively evaluated for impairment	120,505		119,705
Loans receivable	120,505		119,705
Allowance for loan losses, individually evaluated for impairment	0		0
Allowance for loan losses, collectively evaluated for impairment	1,245		1,234
Allowance for loan losses	1,245	1,347	1,234	1,093	957	1,311
Commercial Portfolio Segment [Member]
Loan balances, individually evaluated for impairment	23,998		1,487
Loan balances, collectively evaluated for impairment	471,522		551,569
Loans receivable	495,520		553,056
Allowance for loan losses, individually evaluated for impairment	0		0
Allowance for loan losses, collectively evaluated for impairment	2,943		2,548
Allowance for loan losses	2,943	3,576	2,548	2,149	2,078	1,652
Consumer Portfolio Segment [Member]
Loan balances, individually evaluated for impairment	0		0
Loan balances, collectively evaluated for impairment	1,355		1,584
Loans receivable	1,355		1,584
Allowance for loan losses, individually evaluated for impairment	0		0
Allowance for loan losses, collectively evaluated for impairment	33		49
Allowance for loan losses	$ 33	$ 41	$ 49	$ 42	$ 46	$ 44

X

- Definition

The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

+ References

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

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