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Note 4 - Loans Receivable (Details Textual) - USD ($)	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Unamortized Loan Cost (Fee)	$ 1,600,000	$ 1,700,000
Financing Receivable, Allowance for Credit Loss	8,249,000	8,345,000	$ 10,032,000	$ 8,129,000	$ 8,345,000
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	1,016,229,000	1,059,106,000
Financing Receivable, Accrued Interest, before Allowance for Credit Loss	1,700,000	1,400,000
Financing Receivable, Modified, Accumulated	0	0
Real Estate or Business Assets [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	2,100,000	3,200,000
Unfunded Loan Commitment [Member] | Other Liabilities [Member]
Financing Receivable, Allowance for Credit Loss	$ 286,000	$ 335,000

X

- Definition

Amount, before allowance for credit loss, of accrued interest on financing receivable.

+ References

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-SubTopic 20
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-Section 50
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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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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.

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Amount of unamortized loan commitment, origination, and other costs (fees) on financing receivable recognized as adjustment to yield. Excludes financing receivable covered under loss sharing agreement.

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