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Note 4 - Goodwill (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Goodwill, Ending Balance $ 165,088   $ 165,088   $ 164,774
Goodwill, Impairment Loss 817 $ 0 817 $ 0  
All Other Reporting Unit [Member]          
Goodwill, Ending Balance $ 4,983   $ 4,983    
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount 8.90%   8.90%    
Goodwill, Impairment Loss $ 817        
Fluent [Member]          
Goodwill Impairment Test, Discount Rate 16.00%   16.00%