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4. SUPPLEMENTAL CASH FLOW INFORMATION (Tables)
 3 Months Ended
Mar. 31, 2017
Supplemental Cash Flow Elements [Abstract]  
Supplemental Cash Flow Information Related Text Supplemental cash flow information is as follows:

   (Unaudited) 
   Three Months Ended 
   March 31, 
   2017   2016 
         
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