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Note 8 - Common Stock - Activity of Stock Purchase Warrants (Details)
 12 Months Ended
Dec. 31, 2016
$ / shares
shares
Outstanding, shares (in shares) 56,442,157
Outstanding, weighted average exercise price (in dollars per share) | $ / shares $ 0.14
Issued (in shares)
Issued (in dollars per share) | $ / shares
Exercised, shares (in shares) (21,884,420)
Exercised, weighted average exercise price (in dollars per share) | $ / shares $ 0.06
Forfeited or expired, shares (in shares) (1,806,159)
Forfeited or expired, weighted average exercise price (in shares) 1
Outstanding, shares (in shares) 32,751,578
Outstanding and exercisable at December 31, 2016 (in dollars per share) | $ / shares $ 0.07