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Note 8 - Stockholders' Equity - Outstanding Stock Purchase Warrants (Details)
 9 Months Ended
Sep. 30, 2016
$ / shares
shares
Outstanding, shares (in shares) | shares 56,442,157
Outstanding, weighted average exercise price (in dollars per share) | $ / shares $ 0.14
Exercised, shares (in shares) | shares (15,821,920)
Exercised, weighted average exercise price (in dollars per share) | $ / shares $ 0.065
Outstanding, shares (in shares) | shares 40,620,237
Outstanding, weighted average exercise price (in dollars per share) | $ / shares $ 0.16
Exercisable, shares (in shares) | shares 38,568,159
Exercisable, weighted average exercise price (in dollars per share) | $ / shares $ 0.16