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Note 5 - Intangible Assets, net (Details) - Finite-lived Intangible Assets Amortization Expense
Dec. 31, 2018
USD ($)
Finite-lived Intangible Assets Amortization Expense [Abstract]  
2019 $ 406,704
2020 406,704
2021 406,704
2022 406,704
2023 $ 406,704