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Note 2 - Summary of Significant Accounting Policies (Tables)
3 Months Ended
Mar. 31, 2016
Notes Tables  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
 
 
Three Months Ended
 
 
 
March 31,
 
 
 
2016
 
 
2015
 
                 
Stock options to purchase common stock
    1,131,768       363,252  
Warrants to purchase common stock
    401,446       301,399  
Rights to common stock
    -       70,755