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Note 9 - Stock-based Compensation (Tables)
 3 Months Ended
Mar. 31, 2019
Notes Tables  
Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block]
    RSU Awards   PRSU Awards
    Shares   Weighted-Average
Grant-Date
Fair Value		   Shares   Weighted-Average
Grant-DateFair Value
                 
Non-vested at December 31, 2018    
502,658
     $
24.93
      
–
     $
–
  
Granted    
263,574
      
22.38
      
57,870
      
22.38
  
Vested    
(248,579
 )    
23.17
      
(27,110
 )    
22.38
  
Forfeited    
(7,270
 )    
24.94
      
–
      
–
  
Non-vested at March 31, 2019    
510,383
     $
24.47
      
30,760
     $
22.38
  
                                 
Vested but unissued at March 31, 2019    
209,148
     $
24.64
      
21,310
     $
22.38
  
Phantom Share Units (PSUs) [Member]  
Notes Tables  
Share-based Payment Arrangement, Activity [Table Text Block]
Phantom Stock Plan   Shares   Fair Value
         
Outstanding at December 31, 2018    
99,313
     $
21.53
  
Granted    
8,168
      
22.15
  
Distributions    
(1,004
 )    
22.01
  
Outstanding at March 31, 2019    
106,477
     $
21.93
  
Vested at March 31, 2019    
105,935
     $
21.93