Quarterly report pursuant to Section 13 or 15(d)

Note 6 - Stock Option Plans - Summary of Option Activity for Employees and Non-employees (Details)

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Note 6 - Stock Option Plans - Summary of Option Activity for Employees and Non-employees (Details) - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Employee Stock Option [Member]    
Number of options (in shares) 1,511,995  
Weighted average exercise price, outstanding (in dollars per share) $ 1.74  
Weighted average remaining contractual life, outstanding (Year) 3 years 113 days 2 years 354 days
Aggregate intrinsic value, outstanding $ 17,921
Number of options granted (in shares) 1,383,121  
Weighted average exercise price, granted (in dollars per share) $ 2.04  
Weighted average remaining contractual life, granted (Year) 4 years 94 days  
Number of options exercised (in shares) (83,333)  
Weighted average exercise price, exercised (in dollars per share) $ 0.75  
Weighted average remaining contractual life, exercised (Year)  
Number of options (in shares) 2,811,783 1,511,995
Weighted average exercise price, outstanding (in dollars per share) $ 1.98 $ 1.74
Number of options exercisable (in shares) 1,380,958  
Weighted average exercise price, exercisable (in dollars per share) $ 1.98  
Weighted average remaining contractual life, exercisable (Year) 2 years 80 days  
Aggregate intrinsic value, exercisable  
Non-employee Options [Member]    
Number of options (in shares) 224,999  
Weighted average exercise price, outstanding (in dollars per share) $ 2.52  
Weighted average remaining contractual life, outstanding (Year) 4 years 208 days 5 years 116 days
Aggregate intrinsic value, outstanding
Number of options granted (in shares)  
Weighted average exercise price, granted (in dollars per share)  
Weighted average remaining contractual life, granted (Year)  
Number of options exercised (in shares)  
Weighted average exercise price, exercised (in dollars per share)  
Weighted average remaining contractual life, exercised (Year)  
Number of options (in shares) 224,999 224,999
Weighted average exercise price, outstanding (in dollars per share) $ 2.52 $ 2.52
Number of options exercisable (in shares) 12,960  
Weighted average exercise price, exercisable (in dollars per share) $ 2.33  
Weighted average remaining contractual life, exercisable (Year) 3 years 248 days  
Aggregate intrinsic value, exercisable  
Number of options forfeited and expired (in shares)  
Weighted average exercise price, forfeited or expired (in dollars per share)