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Note 5 - Property and Equipment (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Depreciation, Total $ 934,194 $ 861,122 $ 1,765,704 $ 1,704,405
Gain (Loss) on Disposition of Property Plant Equipment, Total $ (50,015) $ (43,254) $ (68,934) $ (25,533)