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Note 7 - Intangible Assets (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Amortization, Total $ 690,905 $ 422,673 $ 1,451,240 $ 795,899