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Note 5 - Share-based Compensation and Employee Benefit Plan (Tables)
 6 Months Ended
Jun. 30, 2017
Notes Tables  
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
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
 
Three months ended June 30, 2016:
  
Number
of
Shares Awarded
    
Weighted Average
Grant Date
Fair Value
  
Unvested at March 31, 2016
    
113,938
    $
14.06
 
Vested
    
(2,526
 )   $
14.72
 
Forfeited
    
(4,213
 )   $
11.31
 
Unvested at June 30, 2016
    
107,199
    $
14.16
 
                 
Six months ended June 30, 2016:
 
 
 
 
 
 
 
 
Unvested at December 31, 2015
    
55,854
    $
12.83
 
Granted
    
58,084
    $
15.25
 
Vested
    
(2,526
 )   $
14.72
 
Forfeited
    
(4,213
 )   $
11.31
 
Unvested at June 30, 2016
    
107,199
    $
14.16