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Note 11 - Share-based Compensation (Details Textual) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares) 0  
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares) 230,213  
Payment, Tax Withholding, Share-based Payment Arrangement $ 1,491 $ (0)