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Note 1 - Summary of Significant Accounting Policies - Estimated Future Amortization Expense (Details) - USD ($)
Jun. 30, 2019
Dec. 31, 2018
2019 $ 181,748  
2020 363,497  
2021 363,497  
2022 264,609  
2023 215,165  
Thereafter 3,203,356  
Total $ 4,591,872 $ 964,495