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Note 9 - Patents and Trademarks, Net - Estimated Future Aggregate Amortization Expense (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
2020 $ 81  
2021 56  
2022 29  
2023 20  
2024 17  
Thereafter 36  
$ 239 $ 322