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4. SUPPLEMENTAL CASH FLOW INFORMATION (Details) - Supplemental Cash Flow Information - USD ($)
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Supplemental Cash Flow Information [Abstract]    
Interest $ 117,947 $ 155,196
Federal, state and local income taxes,    
net of refunds 988,056 3,500,971
Fixed asset purchases in accounts payable $ 148,357 $ 147,296