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Note 6 - Intangible Assets - Estimated Amortization Expense of Intangible Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
2019 $ 9,195  
2020 7,664  
2021 7,197  
2022 7,197  
2023 4,822  
Thereafter 31,065  
Total $ 67,140 $ 91,482