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Note 5 - Intangible Assets - Estimated Future Amortization Expense of Intangible Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
2019 (Remainder) $ 332  
2020 1,259  
2021 1,259  
2022 1,259  
2023 1,252  
Thereafter 7,248  
Total intangible assets, net $ 12,609 $ 10,249