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Note 10 - Taxes (Details Textual) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense, Total $ 0 $ 0
Unrecognized Tax Benefits, Ending Balance $ 0  
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 23.00% 21.00%