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Note 5 - Share-based Compensation and Employee Benefit Plan (Tables)
 3 Months Ended
Mar. 31, 2017
Notes Tables  
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
Three months ended March 31, 2017:
  
Number
of
Shares Awarded
    
Weighted Average
Grant Date
Fair Value
  
Unvested at December 31, 2016
    
35,264
    $
12.84
 
Vested
    
(2,231
 )   $
(13.03
 )
Unvested at March 31, 2017
    
33,033
    $
12.55
 
                 
Three months ended March 31, 2016:
 
 
 
 
 
 
 
 
Unvested at December 31, 2015
    
55,854
    $
12.83
 
Granted
    
58,084
    $
15.25
 
Unvested at March 31, 2016
    
113,938
    $
14.06