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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 |  |  |

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