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Note 5 - Intangible Assets - Schedule of Estimated Future Amortization Expense of Intangible Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
2018 (Remainder) $ 291  
2019 1,110  
2020 932  
2021 932  
2022 932  
Thereafter 5,221  
Total $ 9,418 $ 6,543