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Note 6 - Stock Compensation Plan (Tables)
9 Months Ended
Sep. 30, 2016
Notes Tables  
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]
    Number of
Shares
  Weighted-
Average Grant
Date Fair Value
per Share
Unvested at December 31, 2015     215,992     $ 8.43  
Granted during the period     596,045     $ 0.51  
Vested during the period     (154,308 )   $ 9.27  
Forfeitures and cancelations     (22,000 )   $ 0.51  
Unvested at September 30, 2016     635,729     $ 1.08  
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
    Shares
Subject to
Options
  Weighted-
Average
Exercise
Price per
Share
  Weighted-
Average
Remaining
Contractual
Term
(in years)
  Aggregate
Intrinsic Value
(in thousands)
Outstanding at December 31, 2015     631,567     $ 2.28                  
Granted     86,800     $ 0.51                  
Forfeitures and cancellations     (137,426 )   $ 2.64                  
Outstanding at September 30, 2016     580,941     $ 1.93       8.8     $  
Options exercisable at September 30, 2016     262,194     $ 2.08       8.8     $  
Options vested and expected to vest as of September 30, 2016     580,941     $ 1.93       8.8     $  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
    Nine Months Ended
September 30,
    2016   2015
Risk-free interest rate   0.52% - 1.38%   1.34% - 1.94%
Expected volatility   66.2% - 75.4%   58.9% - 67.8%
Weighted-average volatility     73.9%     60.1%
Dividend yield     0%     0%
Weighted-average expected term (in years)     1.8       6.0  
Weighted-average grant date fair value per share   $0.17     $0.91  
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
    Three Months Ended
September 30,
  Nine Months Ended
September 30,
(in thousands)   2016   2015   2016   2015
Cost of revenue   $ 7     $ 12     $ 20     $ 45  
Research and development     7       27       16       69  
Selling and marketing     14       15       49       38  
General and administrative     65       784       1,356       2,106  
Total   $ 93     $ 838     $ 1,441     $ 2,258