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Note 6 - Inventory (Tables)
 9 Months Ended
Aug. 31, 2020
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
August 31, 2020
    
November 30, 2019
  
Raw materials
   $
7,162,508
     $
7,156,001
  
Work in process
    
347,705
      
492,125
  
Finished goods
    
4,147,072
      
3,905,373
  
Gross inventory
   $
11,657,285
     $
11,553,499
  
Less: Reserves
    
(2,634,687
 )    
(2,774,992
 )
Net Inventory
   $
9,022,598
     $
8,778,507