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Note 4 - Loans Receivable (Details Textual) - USD ($) | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | --- | --- | ---
Financing Receivable, Unamortized Loan Cost (Fee) | $ 1,500,000 |  | $ 1,700,000 |  |  |
Financing Receivable, Allowance for Credit Loss | 8,142,000 | $ 8,249,000 | 8,345,000 | $ 9,226,000 | $ 10,032,000 | $ 8,129,000
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process | 995,887,000 |  | 1,059,106,000 |  |  |
Financing Receivable, Accrued Interest, before Allowance for Credit Loss | 1,900,000 |  | 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 | $ 262,000 |  | $ 335,000 |  |  |

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