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Note 2 - Stock-based Compensation (Tables)
 3 Months Ended
Mar. 31, 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
  
Restricted stock unit awards granted    
(5
 )    
—
      
—
  
Restricted stock unit awards cancelled    
2
      
—
      
—
  
Stock option awards granted    
(2,296
 )    
2,296
      
5.51
  
Stock option awards exercised    
—
      
(319
 )    
3.50
  
Stock option awards cancelled    
617
      
(617
 )    
10.90
  
                         
Balance March 31, 2017    
591
      
13,455
     $
6.24
  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
    2017
Expected Life in Years    
5.5
  
Expected Volatility    
82
 %
Expected Dividend Yield    
0.0
 %
Risk-Free Interest Rate    
1.9
 %