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Note 5 - Share-Based Compensation (Tables)
3 Months Ended
Mar. 31, 2019
Notes Tables  
Schedule of Employee Service Share Based Compensation Allocation of Recognized Period Costs, By Award Type [Table Text Block]
    Three Months Ended
March 31,
Share-based compensation related to:   2019   2018
Common stock grants   $
100
    $
100
 
Stock option grants    
7
     
15
 
Restricted Stock Unit Awards ("RSUs")    
187
     
122
 
Total share-based compensation   $
294
    $
237
 
Share-based Payment Arrangement, Option, 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, 2018    
134,043
    $
20.46
     
 
     
 
 
Granted    
-
     
 
     
 
     
 
 
Exercised    
(17,205
)    
32.50
     
 
     
 
 
Outstanding at March 31, 2019    
116,838
    $
21.04
     
4.65
    $
1,912
 
Exercisable at March 31, 2019    
109,338
    $
20.51
     
4.71
    $
1,847
 
Vested and expected to vest at March 31, 2019    
116,838
    $
21.04
     
4.65
    $
1,912
 
Share-based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]
    Restricted
Stock Units
  Weighted Average
Award Date
Fair Value
Outstanding at December 31, 2018    
72,176
    $
23.60
 
Awarded    
61,710
     
33.05
 
Shares vested    
(19,860
)    
23.53
 
Outstanding at March 31, 2019    
114,026
    $
26.12