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Note 2 - Summary of Significant Accounting Policies (Tables)
6 Months Ended
Jun. 30, 2016
Notes Tables  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
 
 
June 30,
 
 
 
2016
 
 
2015
 
                 
Stock options to purchase common stock
    1,126,287       375,752  
Warrants to purchase common stock
    506,379       358,119  
Restricted common stock awards
    39,494       -