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Note 9 - Share-based Compensation (Tables)
 3 Months Ended
Feb. 28, 2018
Notes Tables  
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
    Three months ended  
    February 28,
2018		   February 28,
2017		  
Stock options   $
948
     $
2,758
    
Performance share unit plan    
952
      
1,110
    
Deferred share unit plan    
49
      
57
    
    $
1,949
     $
3,925
    
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, 2017    
17,551
     $
3.24
      
 
      
 
  
Granted    
3,402
      
3.86
      
 
      
 
  
Exercised    
(725
 )    
3.43
      
 
      
 
  
Expired    
(130
 )    
3.41
      
 
      
 
  
Forfeited    
(5
 )    
4.18
      
 
      
 
  
February 28, 2018    
20,093
     $
3.35
      
2.61
     $
14,720
  
Vested and exercisable as of February 28, 2018    
15,542
     $
3.02
      
1.60
     $
14,484
  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
    Three months ended  
    February 28,
2018		   February 28,
2017		  
Weighted-average assumptions used to value stock option awards:                  
Expected volatility    
50
 %    
50
 %  
Expected term of options (years)    
3
      
3
    
Expected dividend rate    
—
      
—
    
Risk-free interest rate    
1.8
 %    
1.2
 %  
Expected forfeiture rate    
2.3
 %    
2.5
 %  
Weighted-average grant-date fair value   $
1.35
     $
2.14
    
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, 2017    
2,176
     $
4.10
      
 
    
Granted    
873
      
3.82
      
 
    
Vested    
—
      
—
      
 
    
Performance adjustment    
(1,240
 )    
3.48
      
 
    
Forfeited    
—
      
—
      
 
    
February 28, 2018    
1,809
     $
4.38
     $
6,800
    
Other PSU-related Information [Table Text Block]
    Three months ended  
    February 28,
2018		   February 28,
2017		  
Performance multiplier on PSUs vested    
—
 %    
113
 %  
Common shares issued (thousands)    
—
      
1,513
    
Total fair value of common shares issued   $
—
     $
6,932
    
Withholding tax paid on PSUs vested   $
—
     $
196