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Note 5 - Inventory
 9 Months Ended
Aug. 31, 2017
Notes to Financial Statements  
Inventory Disclosure [Text Block]
5
)
Inventory
 
Major classes of inventory are:
 
   
August 31, 2017
    
November 30, 2016
  
Raw materials
   $
8,977,615
     $
8,568,624
  
Work in process
    
328,017
      
509,198
  
Finished goods
    
6,097,961
      
7,054,736
  
    $
15,403,593
     $
16,132,558
  
                 
Less: Reserves
    
(2,223,129
 )    
(2,603,206
 )
    $
13,180,464
     $
13,529,352