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4. SUPPLEMENTAL CASH FLOW INFORMATION (Tables)
 6 Months Ended
Jun. 30, 2016
Supplemental Cash Flow Elements [Abstract]  
Supplemental Cash Flow Information Related Text Supplemental cash flow information is as follows:

   (Unaudited) 
   Six Months Ended 
   June 30, 
   2016   2015 
         
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