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Note 14 - Stock-based Compensation (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
 
 
Shares
Underlying
Awards
 
 
Weighted
Average
Exercise Price
 
                 
Outstanding— January 1, 2016
    
227,449
     $
6.68
  
Granted
    
--
     $
--
  
Exercised
    
(21,664
 )   $
6.52
  
Forfeited
    
(4,111
 )   $
6.06
  
Expired
    
(3,111
 )   $
5.35
  
                 
Outstanding—December 31, 2016
    
198,563
     $
6.73
  
Exercisable—December 31, 2016
    
184,674
     $
6.62
  
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
 
 
Restricted
Stock Units
 
 
Weighted
Average Grant
Date Fair Value
 
                 
Outstanding— January 1, 2016
    
273,316
     $
8.37
  
Granted
    
85,337
     $
8.54
  
Vested
    
(90,906
 )   $
8.45
  
Forfeited
    
(5,078
 )   $
7.73
  
                 
Outstanding—December 31, 2016
    
262,669
     $
8.41