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Note 2 - Stock-based Compensation (Tables)
 3 Months Ended
Mar. 31, 2020
Notes Tables  
Share-based Payment Arrangement, Activity [Table Text Block]
    Awards
Available		   Options
Outstanding		   Weighted
Average
Exercise
Price
Balance December 31, 2019    
968
      
21,050
     $
5.96
  
Restricted stock unit awards granted    
(13
 )    
-
      
-
  
Restricted stock unit awards cancelled    
-
      
-
      
-
  
Stock option awards granted    
(15
 )    
15
      
2.75
  
Stock option awards exercised    
-
      
-
      
-
  
Stock option awards cancelled    
1,838
      
(1,838
 )    
6.90
  
                         
Balance March 31, 2020    
2,778
      
19,227
     $
5.87
  
    Awards
Available		   Options
Outstanding		   Weighted
Average
Exercise
Price
Balance December 31, 2019    
171
      
1,329
     $
3.60
  
Plan amendment    
1,700
      
-
      
-
  
Stock option awards granted    
(759
 )    
759
      
2.60
  
Stock option awards exercised    
-
      
-
      
-
  
Stock option awards cancelled    
55
      
(55
 )    
6.53
  
                         
Balance March 31, 2020    
1,167
      
2,033
     $
3.15
  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
    2020  
2019
Expected Life in Years    
5.5
      
5.5
  
Expected Volatility    
83.5
 %    
81.0
 %
Expected Dividend Yield    
0.0
 %    
0.0
 %
Risk-Free Interest Rate    
0.8
 %    
2.5
 %