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Note 12 - Share-based Compensation (Tables)
 12 Months Ended
Dec. 31, 2018
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, 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
  
Granted
    
18,323
     $
18.07
  
Vested
    
(10,999
 )   $
16.21
  
Forfeited
    
(1,404
 )   $
14.44
  
Unvested at December 31, 2018
    
31,790
     $
14.06