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Note 11 - Share-based Compensation (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
   
Number
of
Shares Awarded
    
Weighted Average
Grant Date
Fair Value
  
Unvested at December 31, 2014
    
79,208
    
$12.79
  
Granted
    
12,700
    
$16.85
  
Vested
    
(32,015
 )  
$13.14
  
Forfeited
    
(4,039
 )  
$14.36
  
Unvested at December 31, 2015
    
55,854
    
$12.83
  
Granted
    
58,084
    
$15.25
  
Vested
    
(8,161
 )  
$14.79
  
Forfeited
    
(70,513
 )  
$14.67
  
Unvested at December 31, 2016
    
35,264
    
$12.84
  
Granted
    
5,084
    
$15.05
  
Vested
    
(7,878
 )  
$14.31
  
Forfeited
    
(6,600
 )  
$15.50
  
Unvested at December 31, 2017
    
25,870
    
$12.15