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4. SUPPLEMENTAL CASH FLOW INFORMATION (Details) - Supplemental Cash Flow Information - USD ($)
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Supplemental Cash Flow Information [Abstract]    
Interest $ 256,979 $ 332,387
Federal, state and local income taxes, net of refunds 1,042,711 4,583,560
Fixed asset purchases in accounts payable $ 450,881 $ 294,363