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Note 4 - Spin-off of Red Violet (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 26, 2018
Mar. 12, 2018
Mar. 08, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Feb. 12, 2018
Disposal Group, Including Discontinued Operation, Cash Contributed             $ 19,700
Disposal Group, Including Discontinued Operation, Number of Shares Per Share Disposal Company 7.5            
Share-based Compensation Arrangement by Share-based Payment Award, Accelerated Vesting, Number   5,157,998 5,157,998        
Share-based Payment Arrangement, Expense         $ 10,341 $ 30,393  
Discontinued Operations, Disposed of by Means Other than Sale, Spinoff [Member]              
Share-based Payment Arrangement, Expense       $ 15,548