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Note 4 - Inventories (Tables)
 12 Months Ended
Nov. 30, 2017
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
November 30, 2017
    
November 30, 2016
  
Raw materials
   $
8,731,985
     $
8,568,624
  
Work in process
    
460,687
      
509,198
  
Finished goods
    
5,395,353
      
7,054,736
  
    $
14,588,025
     $
16,132,558
  
Less: Reserves
    
(2,621,303
 )    
(2,603,206
 )
    $
11,966,722
     $
13,529,352