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Note 7 - Intangible Assets - Summary of Estimated Amortization Expense (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
2018 $ 459  
2019 213  
2020 213  
2021 213  
2022 213  
Thereafter 592  
Total $ 1,903 $ 2,398