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Note 5 - Intangible Assets - Estimated Future Amortization Expense of Intangible Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
2019 (Remainder) $ 656  
2020 1,175  
2021 1,175  
2022 1,175  
2023 1,168  
Thereafter 6,522  
Total intangible assets, net $ 11,871 $ 10,249