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Note 9 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00% 21.00% 21.00%
Unrecognized Tax Benefits, Ending Balance $ 0 $ 0  
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total $ 0 $ 0