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Note 8 - Income Taxes (Details Textual) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
Income Tax Expense (Benefit) | $ 57 | $ 1,510
Effective Income Tax Rate Reconciliation, Percent | 6.00% | 22.40%
Supplemental Executive Retirement Plan (SERP) [Member] |  |
Effective Income Tax Rate Reconciliation, Tax Exempt Income, Amount |  | $ 200
Put Option [Member] |  |
Effective Income Tax Rate Reconciliation, Tax Exempt Income, Amount |  | $ 400

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