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Note 4 - Goodwill (Details Textual) - USD ($)
$ in Thousands
Sep. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 01, 2020
Apr. 01, 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%      
Winopoly, LLC [Member]          
Goodwill, Ending Balance         $ 1,131
Business Combination, Step Acquisition, Equity Interest in Acquiree, including Subsequent Acquisition, Percentage, Total       100.00%