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Note 4 - Loans Receivable - Loans Receivable (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Loans receivable	$ 1,016,229	$ 1,059,106
Allowance for credit losses	(8,249)	(8,345)	$ (10,032)	$ (8,129)	$ (8,345)
Loans, net	1,007,980	1,050,761
Commercial Portfolio Segment [Member]
Loans receivable	360,328	393,321
Allowance for credit losses	(1,621)	(2,303)	(3,576)	(2,548)	(2,303)
Consumer Portfolio Segment [Member]
Loans receivable	1,248	1,364
Allowance for credit losses	(34)	(32)	(41)	(49)	(32)
One-to-Four Family Residential Real Estate [Member] | Real Estate Portfolio [Member]
Loans receivable	18,247	18,945
Allowance for credit losses	(331)	(295)	(354)	(281)	(295)
Multi-family Mortgage [Member] | Real Estate Portfolio [Member]
Loans receivable	526,087	527,460
Allowance for credit losses	(4,819)	(4,549)	(4,714)	(4,017)	(4,549)
Nonresidential Real Estate [Member] | Real Estate Portfolio [Member]
Loans receivable	110,319	118,016
Allowance for credit losses	$ (1,444)	$ (1,166)	$ (1,347)	$ (1,234)	$ (1,166)

X

- Definition

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

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- 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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