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Note 5 - Intangible Assets - Estimated Future Amortization Expense (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
2022 $ 550  
2023 664  
2024 661  
2025 661  
2026 422  
2027 and thereafter 311  
Total $ 3,269 $ 3,453