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Note 6 - Intangible Assets - Estimated Aggregate Future Amortization Expense (Details) - USD ($)
Jun. 30, 2021
Dec. 31, 2020
2021 (remainder of year) $ 336,867  
2022 673,735  
2023 673,735  
2024 671,334  
2025 445,955  
Balance $ 2,801,626 $ 3,595,326