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Note 5 - Stock-based Compensation (Tables)
 3 Months Ended
Mar. 31, 2019
Notes Tables  
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block]
 
 		  
 		 Three Months Ended
March 31,
    2019   2018
Share-based compensation related to:                
Stock option grants   $
102
     $
58
  
Restricted Stock Unit awards ("RSUs")    
56
      
77
  
Total share-based compensation   $
158
     $
135
  
Share-based Compensation, Stock Options, Activity [Table Text Block]
 
 
 		  
 
 		  
Number of
Shares		  
 
 		 Weighted Average
Exercise Price
Per Share		  
 
 		 Weighted Average
Remaining
Contractual Life
(in years)		  
 
 		 Aggregate
Intrinsic
Value
(1)
Outstanding, December 31, 2018    
398
     $
17.09
      
8.2
     $
493
  
Granted    
-
      
 
      
 
      
 
  
Exercised    
-
      
 
      
 
      
 
  
Forfeited    
-
      
 
      
 
      
 
  
Outstanding, March 31, 2019    
398
     $
17.09
      
7.9
     $
203
  
                                 
Exercisable, March 31, 2019    
143
     $
14.51
      
7.3
     $
123
  
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
    Number of
Shares		   Weighted
Average Price
per Share
(2)
   Weighted
Average Fair
Value
(2)
             
Outstanding & Unvested, December 31, 2018    
19
     $
18.20
     $
343
  
Granted    
-
      
 
      
 
  
Converted to common stock    
-
      
 
      
 
  
Cancelled    
-
      
 
      
 
  
Forfeited    
-
      
 
      
 
  
Outstanding & Unvested, March 31, 2019    
19
     $
18.20
     $
343