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Note 5 - Property and Equipment (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Depreciation, Total $ 861,122 $ 306,714 $ 1,704,405 $ 635,407
Gain (Loss) on Disposition of Property Plant Equipment, Total $ (43,254) $ (81,857) $ (25,533) $ (81,857)