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Note 5 - Intangible Assets - Estimated Future Amortization Expense (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
2020 $ 183  
2021 733  
2022 725  
2023 664  
2024 661  
2025 and thereafter 1,403  
Total $ 4,369 $ 4,919