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LEASES - Supplemental information regarding cash flows from operations (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
LEASES        
Operating lease costs $ 83,589 $ 295,631 $ 439,896 $ 876,889
Short term lease costs (1) 964,873 1,205,407 2,903,387 3,347,484
Financing lease costs:        
Amortization of financing lease assets (2) 85,367 71,854 189,831 215,560
Interest on lease liabilities (3) $ 5,160 $ 7,172 $ 14,166 $ 24,022