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Note 4 - Share-based Compensation (Tables)
6 Months Ended
Jun. 30, 2017
Notes Tables  
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
    Three Months Ended
June 30,
  Six Months Ended
June 30,
Share-based compensation related to:   2017   2016   2017   2016
Common stock granted to the Board of Directors   $
105
    $
105
    $
105
    $
105
 
Common stock granted to the Chief Executive Officer    
100
     
100
     
200
     
200
 
Stock options granted to directors and employees    
117
     
141
     
126
     
177
 
Restricted Stock Unit awards to employees    
105
     
95
     
205
     
160
 
Total share-based compensation   $
427
    $
441
    $
636
    $
642
 
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, 2016    
232,578
    $
16.53
     
 
     
 
 
Granted    
12,336
     
27.05
     
 
     
 
 
Exercised    
(33,196
)    
26.45
     
 
     
 
 
Expired    
(3,750
)    
18.85
     
 
     
 
 
Outstanding at June 30, 2017    
207,968
    $
17.41
     
3.75
    $
2,201
 
Exercisable at June 30, 2017    
201,718
    $
17.21
     
3.80
    $
2,177
 
Vested and expected to vest at June 30, 2017    
207,968
    $
17.41
     
3.75
    $
2,201
 
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
Expected volatility
29.1%
Expected dividends
None
Risk-free interest rate
1.84%
Exercise price
$27.05
Expected term (in years)
5.8
Weighted-average grand date fair value
$8.51
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]
    Restricted
Stock Units
  Weighted Average
Award Date
Fair Value
Unvested at December 31, 2016    
46,558
    $
20.05
 
Awarded    
30,360
     
24.70
 
Shares vested    
(13,419
)    
23.54
 
Unvested at June 30, 2017    
63,499
    $
21.23