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Note 7 - Intangible Assets (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Amortization, Total $ 1,029,015 $ 2,856,572 $ 1,980,836 $ 5,705,124
Customer Relationships [Member]        
Finite-Lived Intangible Asset, Useful Life (Year)     10 years