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Note 5 - Stock-based Compensation (Tables)
 9 Months Ended
Sep. 30, 2019
Notes Tables  
Share-based Payment Arrangement, Cost by Plan [Table Text Block]
    Three Months Ended   Nine Months Ended
    September 30,   September 30,
    2019   2018   2019   2018
Share-based compensation related to:                                
Stock option grants   $
151
     $
102
     $
372
     $
233
  
Restricted Stock Unit awards ("RSUs")    
39
      
56
      
137
      
203
  
Total share-based compensation   $
190
     $
158
     $
509
     $
436
  
Share-based Payment Arrangement, Option, Activity [Table Text Block]
        Weighted Average   Weighted Average   Aggregate
   
Number of
  
Exercise Price
  
Remaining
  
Intrinsic
   
Shares
  
Per Share
  
Contractual Life (years)
   Value
(1)
Outstanding, December 31, 2018    
398
 
   $
17.09
 
  
8.2
   $
493
 
Granted    
192
 
   $
10.60
 
  
 
    
 
 
Exercised    
-
 
    
-
 
  
 
    
 
 
Forfeited    
-
 
    
-
 
  
 
    
 
 
Outstanding, September 30, 2019    
590
 
   $
14.98
 
  
8.1
   $
-
 
                             
Exercisable, September 30, 2019    
239
 
   $
14.55
 
  
7.2
   $
-
 
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    
18
     $
10.60
     $
191
  
Converted to common stock    
(10
 )    
 
      
 
  
Cancelled    
(3
 )    
 
      
 
  
Forfeited    
-
      
 
      
 
  
Outstanding & Unvested, September 30, 2019    
24
     $
12.84
     $
311