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Note 2 - Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
 
 
December 31,
 
 
 
2016
 
 
2015
 
                 
Stock options to purchase common stock
   
1,909,764
     
1,022,195
 
Warrants to purchase common stock
   
425,274
     
383,321
 
Restricted common stock awards
   
58,155
     
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