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Note 1 - Description of Business and Basis of Presentation (Details Textual) - USD ($) $ in Thousands | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2020 | Jan. 01, 2020 | Dec. 31, 2019
Goodwill and Intangible Asset Impairment, Total | $ 0 |  |
Retained Earnings (Accumulated Deficit), Ending Balance | $ 1,306,530 |  | $ 1,084,383
Accounting Standards Update 2016-13 [Member] |  |  |
Retained Earnings (Accumulated Deficit), Ending Balance |  | $ (1,147) |

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