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Note 13 - Leases - Supplemental Cash Flow Information Related to Operating Leases (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Cash payments for operating leases $ 1,852,342 $ 1,738,914 $ 3,552,255 $ 3,385,303
New operating lease assets obtained in exchange for operating lease liabilities $ 350,182 $ 221,192 $ 7,903,992 $ 664,946