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Note O - Summary of Warrant Activity (Details) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Total warrants (in shares) | 19,047,081 | 19,334,579 |
Weighted average exercise price (in dollars per share) | $ 0.37 | $ 0.52 |
Weighted average remaining life | 3 years 7 days | 3 years 332 days | 2 years 288 days
Total warrants, granted (in shares) | 1,408,333 | 11,962,501 |
Weighted average exercise price, granted (in dollars per share) | $ 0.26 | $ 0.30 |
Exercised (in shares) |  | (150,000) |
Exercised (in dollars per share) |  | $ 0.20 |
Forfeited (in shares) |  | (7,974,999) |
Forfeited (in dollars per share) |  | $ 0.50 |
Expired (in shares) |  | (125,000) |
Expired (in dollars per share) |  | $ 0.60 |
Repurchased (in shares) |  | (4,000,000) |
Repurchased (in dollars per share) |  | $ 0.60 |
Outstanding, as of December 31, 2014 (in shares) | 20,455,414 | 19,047,081 | 19,334,579
Outstanding, as of December 31, 2014 (in dollars per share) | $ 0.37 | $ 0.37 | $ 0.52
Vested or expected to vest (in shares) | 20,455,414 |  |
Vested or expected to vest (in dollars per share) | $ 0.37 |  |
Vested or expected to vest | 3 years 7 days |  |
Exercisable (in shares) | 20,311,664 |  |
Exercisable (in dollars per share) | $ 0.37 |  |
Exercisable | 3 years 3 days |  |

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- Definition Number of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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