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Note 2 - Stock-based Compensation (Tables)
9 Months Ended
Sep. 30, 2016
Notes Tables  
Schedule of Share-based Compensation, Activity [Table Text Block]
    Awards
Available
  Options
Outstanding
  Weighted
Average
Exercise
Price
Balance December 31, 2015     16       10,671     $ 7.50  
Plan amendment     3,800              
Restricted stock unit awards granted     (28 )            
Restricted stock unit awards cancelled     15              
Stock option awards granted     (2,248 )     2,248       3.20  
Stock option awards exercised           (88 )     2.23  
Stock option awards cancelled     593       (593 )     11.13  
                         
Balance September 30, 2016     2,148       12,238     $ 6.57  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
    2016   2015
Expected Life in Years     5.5       5.5  
Expected Volatility     82 %     83 %
Expected Dividend Yield     0.0 %     0.0 %
Risk-Free Interest Rate     1.4 %     1.5 %