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Note 5 - Share-based Compensation (Tables)
9 Months Ended
Sep. 30, 2018
Notes Tables  
Schedule of Employee Service Share Based Compensation Allocation of Recognized Period Costs, By Award Type [Table Text Block]
    Three Months Ended
September 30,
  Nine Months Ended
September 30,
Share-based compensation related to:   2018   2017   2018   2017
Common stock grants   $
100
    $
100
    $
405
    $
405
 
Stock option grants    
9
     
4
     
143
     
130
 
Restricted Stock Unit awards ("RSUs")    
163
     
102
     
415
     
307
 
Total share-based compensation   $
272
    $
206
    $
963
    $
842
 
Share-based Compensation, Stock Options, Activity [Table Text Block]
    Shares Under
Options
 
Weighted

Average

Exercise Price

(per share)
 
Weighted
Average
Remaining
Contractual
Life

(in years)
 
Aggregate
Intrinsic
Value

(in thousands)
Outstanding at December 31, 2017    
202,379
    $
18.23
     
 
     
 
 
Granted    
10,344
     
31.20
     
 
     
 
 
Exercised    
(78,680
)    
16.14
     
 
     
 
 
Outstanding at September 30, 2018    
134,043
    $
20.46
     
4.75
    $
2,183
 
Exercisable at September 30, 2018    
122,793
    $
19.71
     
4.80
    $
2,093
 
Vested and expected to vest at September 30, 2018    
134,043
    $
20.46
     
4.75
    $
2,183
 
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
Expected volatility    
27.7
%  
Expected dividends    
None
   
Risk-free interest rate    
2.70
%  
Exercise price   $
31.20
   
Expected term (in years)    
6.0
   
Weighted-average grant date fair value   $
10.15
   
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]
    Restricted
Stock Units
  Weighted Average
Award Date
Fair Value
Outstanding at December 31, 2017    
57,395
    $
21.03
 
Awarded    
29,867
     
29.30
 
Shares vested    
(16,050
)    
23.55
 
Outstanding at September 30, 2018    
71,212
    $
23.48