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Note 15 - Leases - Supplemental Cash Flow Information Related to Operating Leases (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Cash payments for operating leases $ 6,211,256 $ 5,776,931
New operating lease assets obtained in exchange for operating lease liabilities $ 881,610 $ 6,551,279