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Note 5 - Intangible Assets (Details Textual) - USD ($)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Finite-Lived Intangible Assets, Net, Ending Balance $ 5,348,652   $ 5,678,649
Amortization of Intangible Assets, Total $ 666,000 $ 760,000