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Note 4 - Inventories (Tables)
12 Months Ended
Nov. 30, 2018
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
November 30, 2018
   
November 30, 2017
 
Raw materials
  $
7,825,278
    $
8,731,985
 
Work in process
   
272,302
     
460,687
 
Finished goods
   
5,051,330
     
5,395,353
 
Total Gross Inventory
  $
13,148,910
    $
14,588,025
 
Less: Reserves
   
(2,891,808
)    
(2,621,303
)
Net Inventory
  $
10,257,102
    $
11,966,722