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Note 5 - Property and Equipment (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Depreciation, Total $ 1,668,984 $ 978,672 $ 4,066,451 $ 2,744,376
Gain (Loss) on Disposition of Property Plant Equipment, Total $ (61,478) $ (20,751) $ (119,904) $ (89,685)