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Note 8 - Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of options issued, exercised and cancelled

A summary of options issued, exercised and cancelled are as follows:

 

    Shares   Weighted- Average Exercise Price ($)   Weighted- Average Remaining Contractual Term   Aggregate Intrinsic Value ($)
Outstanding at December 31, 2013       82,336     $ 42,42       9.09       —  
Granted       13,159       21.21       9.11       —  
Cancelled       (28,061 )     46.46       —       —  
Outstanding at December 31, 2014       67,434     $ 26.26       8.11       —  
Granted       1,683       2.08       9.18       —  
Cancelled       (1,238 )     18.79       —       —  
                                   
Outstanding at December 31, 2015       67,879     $ 21.40       7.17       —  
                                   
Exercisable at December 31, 2015       66,270     $ 36.70       6.79       —