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Note 5 - Property and Equipment (Details Textual) - USD ($)
3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2018
Sep. 30, 2017
Depreciation, Total $ 469,163 $ 274,707   $ 1,104,570 $ 731,415
Gain (Loss) on Disposition of Property Plant Equipment, Total $ (132,895) $ (81,857) $ (81,857) $ (361,326)