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Note 5 - Intangible Assets - Estimated Aggregate Future Amortization Expense (Details) - USD ($)
Mar. 31, 2020
Dec. 31, 2019
2020 (remainder of year) $ 969,002  
2021 1,292,002  
2022 1,292,002  
2023 1,269,701  
2024 525,945  
Balance $ 5,348,652 $ 5,678,649