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Note 8 - Patents and Trademarks, Net - Estimated Future Aggregate Amortization Expense (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
2019 $ 84  
2020 81  
2021 56  
2022 29  
2023 20  
Thereafter 52  
$ 322 $ 408