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Note 13 - Share-based Compensation (Tables)
 12 Months Ended
Nov. 30, 2017
Notes Tables  
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
    Years ended November 30,
    2017   2016   2015
Stock options   $
5,496
     $
5,855
     $
4,736
  
Performance share unit plan    
4,588
      
4,184
      
4,537
  
Deferred share unit plan    
209
      
224
      
215
  
    $
10,293
     $
10,263
     $
9,488
  
Share-based Compensation, Stock Options, Activity [Table Text Block]
    Number of
stock
options
(thousands)		   Weighted-
average
exercise
price per
share		   Weighted-
average
remaining
contractual term
(years)		   Aggregate
intrinsic
value
November 30, 2016    
19,829
     $
3.59
      
 
      
 
  
Granted    
3,545
      
4.58
      
 
      
 
  
Exercised    
(3,554
 )    
4.54
      
 
      
 
  
Expired    
(2,197
 )    
9.42
      
 
      
 
  
Forfeited    
(72
 )    
4.60
      
 
      
 
  
November 30, 2017    
17,551
     $
3.24
      
2.30
     $
13,837
  
Vested and exercisable as of November 30, 2017    
14,058
     $
2.98
      
1.96
     $
13,837
  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
    Years ended November 30,
    2017   2016   2015
Weighted-average assumptions used to value stock option awards:                        
Expected volatility    
50
 %    
54
 %    
60
 %
Expected term of options (years)    
3
      
3
      
3
  
Expected dividend rate    
—
      
—
      
—
  
Risk-free interest rate    
1.2
 %    
0.5
 %    
1.1
 %
Expected forfeiture rate    
2.5
 %    
3.0
 %    
4.0
 %
Weighted-average grant-date fair value   $
1.60
     $
1.37
     $
1.12
  
Intrinsic value of options exercised   $
5,014
     $
1,510
     $
427
  
Cash received from options exercised    
—
      
—
      
—
  
Schedule of Share-based Compensation, Performance Share Units, Activity [Table Text Block]
    Number of
PSU awards
(thousands)		   Weighted-
average
grant day
fair value
per award		   Aggregate
intrinsic
value
November 30, 2016    
2,619
     $
3.15
      
 
  
Granted    
940
      
4.58
      
 
  
Vested    
(1,556
 )    
2.83
      
 
  
Performance adjustment    
179
      
2.83
      
 
  
Forfeited    
(6
 )    
4.32
      
 
  
November 30, 2017    
2,176
     $
4.10
     $
2,158
  
Other PSU-related Information [Table Text Block]
    Years ended November 30,
    2017   2016   2015
Performance multiplier on PSUs vested    
113
 %    
140
 %    
137
 %
Common shares issued (thousands)    
1,513
      
1,377
      
506
  
Total fair value of common shares issued   $
6,932
     $
5,151
     $
1,351
  
Withholding tax paid on PSUs vested   $
196
     $
4,275
     $
827