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Note 8 - Stockholders' Equity - Outstanding Stock Purchase Warrants (Details)
 9 Months Ended
Sep. 30, 2017
$ / shares
shares
Outstanding (in shares) | shares 32,751,578
Outstanding, weighted average exercise price (in dollars per share) | $ / shares $ 0.07
Exercised (in shares) | shares (3,816,667)
Exercised, weighted average exercise price (in dollars per share) | $ / shares $ 0.04
Forfeited or expired (in shares) | shares (1,112,001)
Forfeited or expired, weighted average exercise price (in dollars per share) | $ / shares $ 0.57
Outstanding (in shares) | shares 27,822,910
Outstanding, weighted average exercise price (in dollars per share) | $ / shares $ 0.02
Exercisable (in shares) | shares 27,822,910
Exercisable, weighted average exercise price (in dollars per share) | $ / shares $ 0.02