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Note 5 - Inventory (Tables)
 9 Months Ended
Aug. 31, 2018
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
August 31, 2018
    
November 30, 2017
  
Raw materials
   $
7,959,989
     $
8,731,985
  
Work in process
    
376,273
      
460,687
  
Finished goods
    
4,721,049
      
5,395,353
  
Gross inventory
   $
13,057,311
     $
14,588,025
  
Less: Reserves
    
(2,388,544
 )    
(2,621,303
 )
Net Inventory
   $
10,668,767
     $
11,966,722