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Note 3 - Intangible Assets - Estimated Amortization Expense (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Nine Months Ended September 30, 2021 $ 739 $ 861  
2021 246    
2022 985    
2023 985    
Thereafter 575    
Total estimated amortization expense $ 2,791   $ 3,530