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Note 5 - Property and Equipment (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Depreciation, Total $ 463,410 $ 469,163 $ 2,167,815 $ 1,104,570
Gain (Loss) on Disposition of Property Plant Equipment, Total $ (2,760) $ (28,293) $ (81,857)