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Note 6 - Intangible Assets (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Finite-Lived Intangible Assets, Net, Ending Balance $ 2,801,626   $ 2,801,626   $ 3,595,326
Amortization of Intangible Assets, Total $ 452,000 $ 679,000 $ 1,100,000 $ 1,400,000