XML 49 R37.htm IDEA: XBRL DOCUMENT v3.8.0.1
Note 8 - Common Stock - Activity of Stock Purchase Warrants (Details)
 12 Months Ended
Dec. 31, 2017
$ / shares
shares
Outstanding, shares (in shares) | shares 32,751,578
Outstanding, weighted average exercise price (in dollars per share) | $ / shares $ 0.07
Issued (in shares) | shares
Issued (in dollars per share) | $ / shares
Exercised (in shares) | shares (31,639,577)
Exercised, weighted average exercise price (in dollars per share) | $ / shares $ 0.02
Forfeited or expired (in shares) | shares (1,112,001)
Forfeited or expired, weighted average exercise price (in dollars per share) | $ / shares $ 0.57
Outstanding, shares (in shares) | shares 0
Outstanding and exercisable at December 31, 2016 (in dollars per share) | $ / shares