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Note 5 - Share-based Compensation and Employee Benefit Plan (Tables)
 9 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
Three months ended September 30, 2017:
  
Number
of
Shares Awarded
    
Weighted Average
Grant Date
Fair Value
  
Unvested at June 30, 2017
    
32,117
     $
12.39
  
Vested
    
(1,692
 )   $
16.80
  
Forfeited
    
(600
 )   $
15.50
  
Unvested at September 30, 2017
    
29,825
     $
12.08
  
                 
Nine months ended September 30, 2017:
  
 
 
 
  
 
 
 
Unvested at December 31, 2016
    
35,264
     $
12.84
  
Granted
    
5,084
     $
15.05
  
Vested
    
(3,923
 )   $
14.66
  
Forfeited
    
(6,600
 )   $
15.50
  
Unvested at September 30, 2017
    
29,825
     $
12.08
  
Three months ended September 30, 2016:
  
Number
of
Shares Awarded
    
Weighted Average
Grant Date
Fair Value
  
Unvested at June 30, 2016
    
107,199
     $
14.16
  
Vested
    
(1,688
 )   $
16.80
  
Forfeited
    
(65,500
 )   $
14.87
  
Unvested at September 30, 2016
    
40,011
     $
12.87
  
                 
Nine months ended September 30, 2016:
  
 
 
 
  
 
 
 
Unvested at December 31, 2015
    
55,854
     $
12.83
  
Granted
    
58,084
     $
15.25
  
Vested
    
(4,214
 )   $
15.55
  
Forfeited
    
(69,713
 )   $
14.66
  
Unvested at September 30, 2016
    
40,011
     $
12.87