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Note 6 - Share-based Compensation (Tables)
3 Months Ended
Mar. 31, 2020
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:   2020   2019
Common stock grants   $
100
    $
100
 
Stock option grants    
60
     
7
 
Restricted Stock Unit Awards ("RSUs")    
377
     
187
 
Total share-based compensation   $
537
    $
294
 
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, 2019    
105,614
    $
25.34
     
 
     
 
 
Granted    
-
     
 
     
 
     
 
 
Exercised    
(19,586
)   $
21.20
     
 
     
 
 
Outstanding at March 31, 2020    
86,028
    $
26.28
     
5.70
    $
1,025
 
Exercisable at March 31, 2020    
65,742
    $
23.04
     
5.00
    $
989
 
Vested and expected to vest at March 31, 2020    
86,028
    $
26.28
     
5.70
    $
1,025
 
Share-based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]
    Restricted
Stock Units
  Weighted Average
Award Date
Fair Value
Outstanding at December 31, 2019    
113,866
    $
28.36
 
Awarded    
42,733
     
49.96
 
Shares vested    
(28,244
)    
27.02
 
Outstanding at March 31, 2020    
128,355
    $
31.58