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Note 4 - Intangible Assets and Goodwill - Estimated Amortization Expense of Intangible Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
2019 (excluding the three months ended March 31, 2019) $ 6,856  
2020 7,664  
2021 7,197  
2022 7,197  
2023 4,822  
Thereafter 31,065  
Total $ 64,801 $ 67,140