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Note 7 - Stockholders' Equity (Deficit) - Summary of Warrants (Details) - $ / shares
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Outstanding January 1, 2016 (in shares) 3,403,367  
Outstanding January 1, 2016 (in dollars per share) $ 1.03  
Outstanding January 1, 2016 (Year) 5 years 222 days 5 years 292 days
Granted (in shares) 423,291  
Granted (in dollars per share) $ 1.25  
Granted (Year) 4 years 43 days  
Outstanding December 31, 2016 (in shares) 3,826,658 3,403,367
Outstanding December 31, 2016 (in dollars per share) $ 1.07 $ 1.03