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Note 7 - Stockholders' Equity (Deficit) - Stock Option Grant Activity (Details) - $ / shares
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Granted (in shares) 1,308,300  
Granted, stock options, weighted average exercise price (in dollars per share) $ 1.25  
Converted (in shares) (25,000)  
Outstanding December 31, 2016 (in shares) 2,484,445  
Outstanding, stock options, weighted average exercise price, December 31, 2016 (in dollars per share) $ 1.04  
The 2006 Plan [Member]    
Outstanding January 1, 2016 (in shares) 1,707,744  
Outstanding, stock options, weighted average exercise price, January 1, 2016 (in dollars per share) $ 0.84  
Outstanding, stock options, weighted average remaining contractual life, January 1, 2016 (Year) 9 years 299 days 6 years 164 days
Granted (in shares) 1,193,300  
Granted, stock options, weighted average exercise price (in dollars per share) $ 1.25  
Granted, stock options, weighted average remaining contractual life (Year) 10 years 127 days  
Expired (in shares) (506,599)  
Expired, stock options, weighted average exercise price (in dollars per share) $ 0.26  
Converted (in shares) (25,000)  
Converted, stock options, weighted average exercise price (in dollars per share) $ 0.26  
Outstanding December 31, 2016 (in shares) 2,484,445 1,707,744
Outstanding, stock options, weighted average exercise price, December 31, 2016 (in dollars per share) $ 1.18 $ 0.84