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Note 6 - Share-based Compensation and Employee Benefit Plan (Tables)
 6 Months Ended
Jun. 30, 2016
Notes Tables  
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
Three months ended June 30, 2016:
 
 
Number of Shares Awarded
 
 
  
Weighted Average
Grant Date Fair
Value
  
Non-vested at March 31, 2016
     113,938     $ 14.06  
Granted
     -       -  
Vested
     (2,526 )     14.72  
Forfeited
     (4,213 )     11.31  
Non-vested at June 30, 2016
     107,199     $ 14.16  
                 
Six months ended June 30, 2016:
 
 
 
 
 
 
 
 
Non-vested at December 31, 2015
     55,854     $ 12.83  
Granted
     58,084       15.25  
Vested
     (2,526 )     14.72  
Forfeited
     (4,213 )     11.31  
Non-vested at June 30, 2016
     107,199     $ 14.16  
Three months ended June 30, 2015:
  
Number of Shares
Awarded
  
 
 
Weighted Average
Grant Date Fair
Value
 
Non-vested at March 31, 2015
     81,923     $ 12.93  
Granted
     -       -  
Vested
     (225 )     17.25  
Non-vested at June 30, 2015
     81,698     $ 12.92  
                 
Six months ended June 30, 2015:
 
 
 
 
 
 
 
 
Non-vested at December 31, 2014
     79,208     $ 12.79  
Granted
     2,940       17.00  
Vested
     (450 )     17.25  
Non-vested at June 30, 2015
     81,698     $ 12.92