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Note 7 - Product Warranty (Tables)
 9 Months Ended
Aug. 31, 2017
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
   
For the three months ended
 
   
August 31, 2017
    
August 31, 2016
  
Balance, beginning
   $
152,964
     $
140,674
  
                 
Settlements / adjustments
    
(46,469
 )    
(36,896
 )
Warranties issued
    
26,699
      
61,922
  
Balance, ending
   $
133,194
     $
165,700
  
   
For the nine months ended
 
   
August 31, 2017
    
August 31, 2016
  
Balance, beginning
   $
134,373
     $
176,531
  
                 
Settlements / adjustments
    
(155,603
 )    
(186,179
 )
Warranties issued
    
154,424
      
175,348
  
Balance, ending
   $
133,194
     $
165,700