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Note 10 - Common Shares (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Share Repurchases [Table Text Block]
   
Year Ended December 31,
  
   
201
7
    
201
6
   
201
5
 
Common stock repurchased on the open market or through tender offer
                        
Number of shares
    
—
      
308,416
      
1,062,456
  
Aggregate market value of shares (in thousands)
   $
—
     $
7,180
     $
23,616
  
Average price per share
   $
—
     $
23.28
     $
22.23
  
                         
Common stock received in connection with share-based compensation
                        
Number of shares
    
50,454
      
25,572
      
99,675
  
Aggregate market value of shares (in thousands)
   $
2,602
     $
634
     $
2,335
  
Average price per share
   $
51.58
     $
24.80
     $
23.42