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Note 5 - Intangible Assets - Estimated Future Amortization Expense (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
2021 $ 183  
2022 725  
2023 664  
2024 661  
2025 661  
2026 and thereafter 742  
Total $ 3,636 $ 4,186