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Note 2 - Stock-based Compensation (Tables)
 6 Months Ended
Jun. 30, 2017
Notes Tables  
Share-based Compensation, Activity [Table Text Block]
    Awards
Available		   Options
Outstanding		   Weighted
Average
Exercise
Price
Balance December 31, 2016    
2,273
      
12,095
     $
6.55
  
Plan amendment    
1,000
      
—
      
—
  
Restricted stock unit awards granted    
(11
 )    
—
      
—
  
Restricted stock unit awards cancelled    
2
      
—
      
—
  
Stock option awards granted    
(2,563
 )    
2,563
      
5.49
  
Stock option awards exercised    
—
      
(368
 )    
3.37
  
Stock option awards cancelled    
877
      
(877
 )    
10.30
  
                         
Balance June 30, 2017    
1,578
      
13,413
     $
6.19
  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
    2017   2016
Expected Life in Years    
5.5
      
5.6
  
Expected Volatility    
82.0
 %    
82.0
 %
Expected Dividend Yield    
0.0
 %    
0.0
 %
Risk-Free Interest Rate    
1.9
 %    
1.4
 %