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Note 4 - Stock-based Compensation (Tables)
 6 Months Ended
Jun. 30, 2020
Notes Tables  
Share-based Payment Arrangement, Cost by Plan [Table Text Block]
    Three Months Ended   Six Months Ended
    June 30,   June 30,
    2020   2019   2020   2019
Share-based compensation related to:                                
Stock option grants   $
126
     $
119
     $
250
     $
221
  
Restricted Stock Unit awards    
34
      
42
      
73
      
98
  
Total share-based compensation   $
160
     $
161
     $
323
     $
319
  
Share-based Payment Arrangement, Option, 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, 2019    
584
     $
14.94
      
7.9
     $
-
  
Granted    
-
      
 
      
 
      
 
  
Exercised    
-
      
 
      
 
      
 
  
Forfeited    
(3
 )   $
4.37
      
 
      
 
  
Outstanding, June 30, 2020    
581
     $
14.93
      
7.4
     $
-
  
                                 
Exercisable, June 30, 2020    
386
     $
15.62
      
6.9
     $
-
  
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, 2019    
24
     $
12.84
     $
311
  
Granted    
-
      
 
      
 
  
Converted to common stock    
(10
 )   $
20.24
      
 
  
Cancelled    
(1
 )   $
20.24
      
 
  
Forfeited    
-
      
 
      
 
  
Outstanding & Unvested, June 30, 2020    
13
     $
11.87
     $
156