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Note 6 - Stock-based Compensation (Tables)
 9 Months Ended
Sep. 30, 2017
Notes Tables  
Share-based Compensation, Stock Options, Activity [Table Text Block]
   
 
 
 
  
 
 
 
  
Weighted-average
    
Aggregate
  
   
 
 
 
  
Weighted-average
    
Remaining Contractual
    
Intrinsic
  
   
Shares
    
Exercise Price
    
Life (in years)
    
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
  
Exercised
   
(19,500
 )    
23.37
      
 
      
 
  
Balance, June 30, 2017
    
45,130
     $
23.37
      
0.7
     $
658
  
Exercised
   
(6,000
 )    
23.37
      
 
      
 
  
Balance, September 30, 2017
    
39,130
     $
23.37
      
0.4
     $
659
  
                                 
Exercisable, September 30, 2017
    
39,130
     $
23.37
      
0.4
     $
659
  
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
   
(297,905
 )
Forfeited
    
(10,424
 )
Balance at September 30, 2017
    
583,494