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Note 7 - Intangible Assets (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Amortization, Total $ 1,608,708 $ 517,176 $ 3,059,948 $ 1,313,075