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Note 8 - Outstanding Stock Purchase Warrants (Details) - $ / shares
 6 Months Ended
Jun. 30, 2016
Outstanding, shares (in shares) 56,442,157
Outstanding, weighted average exercise price (in dollars per share) $ 0.14
Exercised, shares (in shares) (5,064,588)
Exercised, weighted average exercise price (in dollars per share) $ 0.065
Outstanding, shares (in shares) 51,377,569
Outstanding, weighted average exercise price (in dollars per share) $ 0.14
Exercisable, shares (in shares) 39,775,491
Exercisable, weighted average exercise price (in dollars per share) $ 0.15