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Note 7 - Intangible Assets (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Amortization, Total $ 1,205,537 $ 1,029,015 $ 2,370,709 $ 1,980,836