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Note 6 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Effective Income Tax Rate Reconciliation, Percent, Total 3.00% 1.00%  
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00%    
Unrecognized Tax Benefits, Ending Balance $ 1,480   $ 1,480