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Note 7 - Share-based Compensation and Employee Benefit Plan (Tables)
 6 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
Three months ended June 30, 2018:
  
Number
of
Shares Awarded
    
Weighted Average
Grant Date
Fair Value
  
Unvested at March 31, 2018
    
37,034
     $
14.20
  
Granted
    
4,124
     $
18.55
  
Vested
    
(1,968
 )   $
16.05
  
Forfeited
    
(1,104
 )   $
14.15
  
Unvested at June 30, 2018
    
38,086
     $
14.57
  
                 
Six months ended June 30, 2018:
  
 
 
 
  
 
 
 
Unvested at December 31, 2017
    
25,870
     $
12.15
  
Granted
    
18,323
     $
18.07
  
Vested
    
(4,903
 )   $
14.93
  
Forfeited
    
(1,204
 )   $
14.26
  
Unvested at June 30, 2018
    
38,086
     $
14.57
  
Three months ended June 30, 2017:
  
Number
of
Shares Awarded
    
Weighted Average
Grant Date
Fair Value
  
Unvested at March 31, 2017
    
33,033
     $
12.55
  
Granted
    
5,084
     $
15.05
  
Forfeited
    
(6,000
 )   $
15.50
  
Unvested at June 30, 2017
    
32,117
     $
12.39
  
                 
Six months ended June 30, 2017:
  
 
 
 
  
 
 
 
Unvested at December 31, 2016
    
35,264
     $
12.84
  
Granted
    
5,084
     $
15.05
  
Vested
    
(2,231
 )   $
13.05
  
Forfeited
    
(6,000
 )   $
15.50
  
Unvested at June 30, 2017
    
32,117
     $
12.39