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Note 6 - Intangible Assets, Net - Future Amortization Expense (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
2019 $ 1,155  
2020 314  
2021 314  
2022 314  
2023 314  
2024 289  
Total intangible assets $ 2,700 $ 1,742