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4. SUPPLEMENTAL CASH FLOW INFORMATION (Details) - Supplemental Cash Flow Information - USD ($)
6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Supplemental Cash Flow Information [Abstract]    
Interest $ 332,387 $ 387,994
Federal, state and local income taxes, net of refunds 4,583,560 964,750
Fixed asset purchases in accounts payable $ 294,363 $ 133,508