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Note 2 - Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2015
Notes Tables  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
 
 
Year Ended
December 31,
 
 
 
2015
 
 
2014
 
                 
Stock options to purchase common stock
    1,022,195       286,501  
Warrants to purchase common stock
    383,321       224,248  
Rights to common stock
    -       70,755