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Note 4 - Deferred Costs and Intangible Assets - Future Amortization Expense (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
2019 (Remainder) $ 527  
2020 801  
2021 775  
2022 743  
2023 597  
Thereafter 5,930  
Total $ 9,373 $ 9,964