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Note 7 - Income Taxes (Details Textual) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Income Tax Expense (Benefit), Total |  | $ 963,000 | $ 269,000 |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  | 21.00% | 21.00% |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount |  | $ 0 | $ 19,000 |
Unrecognized Tax Benefits, Ending Balance |  | 278,000 | $ 295,000 | $ 275,000
Unrecognized Tax Benefits, Income Tax Penalties Accrued |  | 43,000 |  |
Unrecognized Tax Benefits, Interest on Income Taxes Accrued |  | 0 |  |
Forecast [Member] | Maximum [Member] |  |  |  |
Unrecognized Tax Benefits, Decrease Resulting from Foreign Taxes | $ 100,000 |  |  |
Domestic Tax Authority [Member] |  |  |  |
Operating Loss Carryforwards |  | 0 |  |
Domestic Tax Authority [Member] | Capital Loss Carryforward [Member] |  |  |  |
Tax Credit Carryforward, Amount |  | 2,679,000 |  |
State and Local Jurisdiction [Member] |  |  |  |
Operating Loss Carryforwards |  | 2,604,000 |  |
State and Local Jurisdiction [Member] | Capital Loss Carryforward [Member] |  |  |  |
Tax Credit Carryforward, Amount |  | $ 129,000 |  |

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