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Note 12 - Leases - Supplemental Cash Flow Information Related to Operating Leases (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Cash payments for operating leases $ 1,590,549 $ 2,935,390
New operating lease assets obtained in exchange for operating lease liabilities $ 321,194 $ 1,437,622