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Note 6 - Intangible Assets - Estimated Aggregate Future Amortization Expense (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
2020 $ 1,372,507  
2021 1,372,507  
2022 1,363,908  
2023 1,346,709  
2024 223,018  
Balance $ 5,678,649 $ 6,441,743