Quarterly report pursuant to Section 13 or 15(d)

Note 2 - Summary of Significant Accounting Policies (Tables)

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Note 2 - Summary of Significant Accounting Policies (Tables)
6 Months Ended
Jun. 30, 2017
Notes Tables  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
 
 
Six Months Ended
 
 
 
June 30,
 
 
 
2017
 
 
2016
 
                 
Stock options to purchase common stock
   
2,287,572
     
1,126,287
 
Warrants to purchase common stock
   
642,622
     
506,379
 
Restricted common stock awards
   
6,250
     
39,494