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4. SUPPLEMENTAL CASH FLOW INFORMATION (Details) - Supplemental Cash Flow Information - USD ($)
9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Supplemental Cash Flow Information [Abstract]    
Interest $ 431,591 $ 516,984
Federal, state and local income taxes, net of refunds 231,707 5,541,408
Fixed asset purchases in accounts payable $ 253,303 $ 430,594