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Note 7 - Stock-based Compensation (Tables)
 9 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
    Shares   Weighted-Average
Grant-Date
Fair Value
         
Non-vested at December 31, 2016    
488,779
     $
18.99
  
Granted    
276,900
      
28.21
  
Vested    
(244,762
 )    
21.93
  
Forfeited    
(22,860
 )    
23.61
  
Non-vested at September 30, 2017    
498,057
     $
22.46
  
                 
Vested but unissued at September 30, 2017    
244,077
     $
22.67
  
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]
 
 		  
 		 For the three months ended
September 30,		  
 		 For the nine months ended
September 30,
(In thousands)   2017   2016   2017   2016
Proceeds from stock options exercised   $
-
     $
5
     $
-
     $
132
  
Fair value of shares received upon exercise of stock options    
-
      
262
      
37
      
612
  
Tax benefit (expense) related to stock options exercised    
-
      
(10
 )    
39
      
(12
 )
Intrinsic value of stock options exercised    
-
      
44
      
96
      
156
  
Phantom Share Units (PSUs) [Member]  
Notes Tables  
Share-based Compensation, Activity [Table Text Block]
Phantom Stock Plan   Shares   Fair Value
         
Outstanding at December 31, 2016    
89,339
     $
29.39
  
Granted    
7,889
      
27.42
  
Forfeited    
(10
 )    
28.95
  
Distributions    
(8,471
 )    
28.69
  
Outstanding at September 30, 2017    
88,747
     $
29.72
  
Vested at September 30, 2017    
88,431
     $
29.72