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Note 4 - Inventories
 12 Months Ended
Nov. 30, 2016
Notes to Financial Statements  
Inventory Disclosure [Text Block]
(4)
Inventories
 
Major classes of inventory are:
 
 
 
November 30, 2016
 
 
November 30, 2015
 
Raw materials
   $
8,568,624
    $
9,699,156
 
Work in process
    
509,198
     
246,823
 
Finished goods
    
7,054,736
     
8,169,267
 
    $
16,132,558
    $
18,115,246
 
Less: Reserves
    
(2,603,206
 )    
(2,930,810
 )
    $
13,529,352
    $
15,184,436