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Note 5 - Intangible Assets - Schedule of Estimated Future Amortization Expense of Intangible Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
2018 (Remainder) $ 537  
2019 1,010  
2020 831  
2021 831  
2022 831  
Thereafter 4,471  
Total $ 8,511 $ 6,543