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Note 5 - Stock-based Compensation (Tables)
 3 Months Ended
Mar. 31, 2017
Notes Tables  
Share-based Compensation, Stock Options, Activity [Table Text Block]
   
Shares
    
Weighted-average
Exercise Price
    
Weighted-average
Remaining Contractual
Life (in years)
    
Aggregate
Intrinsic
Value (in thousands)
  
                                 
Balance, December 31, 2016
    
82,670
     $
23.37
      
1.1
     $
1,211
  
Exercised
    
(18,040
 )    
23.37
      
 
      
 
  
Balance, March 31, 2017
    
64,630
     $
23.37
      
0.9
     $
925
  
Exercisable, March 31, 2017
    
64,630
     $
23.37
      
0.9
     $
925
  
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]
   
Units
  
Balance at December 31, 2016
    
727,419
  
Granted
    
164,404
  
Distributed
    
(297,171
 )
Forfeited
    
(1,367
 )
Balance at March 31, 2017
    
593,285