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4. SUPPLEMENTAL CASH FLOW INFORMATION (Details) - Supplemental Cash Flow Information - USD ($)
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Supplemental Cash Flow Information [Abstract]    
Interest $ 99,546 $ 117,947
Federal, state and local income taxes,    
net of refunds 36,499 988,056
Fixed asset purchases in accounts payable $ 108,345 $ 148,357