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Note 6 - Stockholders' Equity - Summary of Warrants (Details) - $ / shares
 9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Outstanding (in shares)   3,826,658
Outstanding, weighted average exercise price (in dollars per share)   $ 1.02
Outstanding, weighted average remaining life (Year) 4 years 343 days 5 years 262 days
Outstanding (in shares) 3,826,658  
Outstanding, weighted average exercise price (in dollars per share) $ 1.05  
Exercisable September 30, 2017 (in shares) 3,826,658  
Exercisable September 30, 2017 (in shares) 1.05  
Exercisable September 30, 2017 (in shares)