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Note 6 - Loss Per Share of Common Stock (Tables)
12 Months Ended
Dec. 31, 2015
Notes Tables  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
 
 
2015
 
 
2014
 
                 
Convertible preferred stock
 
 
994,800
 
    2,996,482  
Warrants
 
 
699,281
 
    699,281  
Stock options
 
 
4,045,239
 
    2,797,239  
 
 
 
5,739,320
 
    6,493,002