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Note 4 - Goodwill (Details Textual) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Goodwill, Ending Balance $ 165,088 $ 165,088
All Other Reporting Unit [Member]    
Goodwill, Ending Balance $ 160,922  
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount 17.00%  
Fluent [Member]    
Goodwill Impairment Test, Discount Rate 14.50%