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Note 3 - Allowance for Doubtful Accounts (Tables)
 12 Months Ended
Nov. 30, 2017
Notes Tables  
Allowance for Credit Losses on Financing Receivables [Table Text Block]
   
For the 12 months ended
  
   
November 30, 201
7
    
November 30, 201
6
  
Balance, beginnin
g
   $
22,746
     $
18,810
  
Provision charged to expens
e
    
11,187
      
4,925
  
Less amounts charged-of
f
    
(1,635
 )    
(989
 )
Balance, endin
g
   $
32,298
     $
22,746