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4. SUPPLEMENTAL CASH FLOW INFORMATION
3 Months Ended
Jun. 30, 2017
Supplemental Cash Flow Elements [Abstract]  
Cash Flow, Supplemental Disclosures [Text Block]
         
 4.   SUPPLEMENTAL CASH FLOW INFORMATION      

Supplemental cash flow information is as follows:


   
Six Months Ended
   
June 30,
   
2017
 
2016
         
Supplemental cash flow information:            
Interest   $174,202    $256,979 
Federal, state and local income taxes, net of refunds   $553,123    $1,042,711 
             
Non-cash information:            
Fixed asset purchases in accounts payable   $779,257    $450,881