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Note 8 - Stockholders' Equity - Outstanding Stock Purchase Warrants (Details)
 3 Months Ended
Mar. 31, 2017
$ / shares
shares
Outstanding, shares (in shares) 32,751,578
Outstanding, weighted average exercise price (in dollars per share) | $ / shares $ 0.07
Exercised, shares (in shares) (983,334)
Exercised, weighted average exercise price (in dollars per share) | $ / shares $ 0.05
Forfeited or expired, shares (in shares) (1,112,001)
Forfeited or expired, weighted average exercise price (in shares) 0.57
Outstanding, shares (in shares) 30,656,243
Outstanding, weighted average exercise price (in dollars per share) | $ / shares $ 0.05
Exercisable, shares (in shares) 30,656,243
Exercisable, weighted average exercise price (in dollars per share) | $ / shares $ 0.05