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Note 6 - Inventory (Tables)
 9 Months Ended
Aug. 31, 2019
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
August 31, 2019
    
November 30, 2018
  
Raw materials
   $
7,341,067
     $
7,825,278
  
Work in process
    
451,970
      
272,302
  
Finished goods
    
4,648,778
      
5,051,330
  
Gross inventory
   $
12,441,815
     $
13,148,910
  
Less: Reserves
    
(2,678,901
 )    
(2,891,808
 )
Net Inventory
   $
9,762,914
     $
10,257,102