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Note 6 - Intangible Assets, Net - Future Amortization Expense (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
2021 (3 months) $ 60  
2022 223  
2023 218  
2024 218  
2025 218  
Thereafter 491  
Total estimated amortization expense $ 1,428 $ 1,053