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Note 5 - Property and Equipment (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Depreciation, Total $ 1,250,663 $ 934,194 $ 2,397,467 $ 1,765,704
Gain (Loss) on Disposition of Property Plant Equipment, Total $ (22,859) $ (50,015) $ (58,426) $ (68,934)