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Note 4 - Loans Receivable - Allowance for Loan Losses and Loans Receivable (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021
Loan balances, individually evaluated for impairment	$ 25,710		$ 2,712
Loan balances, collectively evaluated for impairment	1,088,453		1,232,160
Loans receivable	1,114,163		1,234,872
Allowance for loan losses, individually evaluated for impairment	0		0
Allowance for loan losses, collectively evaluated for impairment	8,559		8,129
Allowance for loan losses	8,559	$ 9,226	8,129	$ 7,386	$ 7,202	$ 6,715
Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate [Member]
Loan balances, individually evaluated for impairment	72		752
Loan balances, collectively evaluated for impairment	19,161		22,381
Loans receivable	19,233		23,133
Allowance for loan losses, individually evaluated for impairment	0		0
Allowance for loan losses, collectively evaluated for impairment	296		281
Allowance for loan losses	296	326	281	315	286	331
Real Estate Portfolio [Member] | Multi-family Mortgage [Member]
Loan balances, individually evaluated for impairment	0		473
Loan balances, collectively evaluated for impairment	528,251		536,921
Loans receivable	528,251		537,394
Allowance for loan losses, individually evaluated for impairment	0		0
Allowance for loan losses, collectively evaluated for impairment	4,547		4,017
Allowance for loan losses	4,547	4,679	4,017	3,566	3,632	3,377
Real Estate Portfolio [Member] | Nonresidential Real Estate [Member]
Loan balances, individually evaluated for impairment	0		0
Loan balances, collectively evaluated for impairment	117,641		119,705
Loans receivable	117,641		119,705
Allowance for loan losses, individually evaluated for impairment	0		0
Allowance for loan losses, collectively evaluated for impairment	1,150		1,234
Allowance for loan losses	1,150	1,245	1,234	1,162	1,093	1,311
Commercial Portfolio Segment [Member]
Loan balances, individually evaluated for impairment	25,638		1,487
Loan balances, collectively evaluated for impairment	422,049		551,569
Loans receivable	447,687		553,056
Allowance for loan losses, individually evaluated for impairment	0		0
Allowance for loan losses, collectively evaluated for impairment	2,535		2,548
Allowance for loan losses	2,535	2,943	2,548	2,231	2,149	1,652
Consumer Portfolio Segment [Member]
Loan balances, individually evaluated for impairment	0		0
Loan balances, collectively evaluated for impairment	1,351		1,584
Loans receivable	1,351		1,584
Allowance for loan losses, individually evaluated for impairment	0		0
Allowance for loan losses, collectively evaluated for impairment	31		49
Allowance for loan losses	$ 31	$ 33	$ 49	$ 112	$ 42	$ 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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