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SUPPLEMENTARY CASH FLOW INFORMATION (Details 1) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Supplementary Cash Flow Information Details 1      
Interest paid $ 444,947 $ 470,736 $ 126,449
Taxes paid 5,764,634 3,135,626 4,574,614
Equipment acquired under finance leases and equipment loans $ 1,227,901 $ 3,452,257 $ 2,289,128