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Note O - Equity - Summary of Warrant Activity (Details) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Total warrants (in shares) | 1,704,628 | 1,587,266 |
Weighted average exercise price (in dollars per share) | $ 4.40 | $ 4.44 |
Weighted average remaining contractual life (Year) | 2 years 284 days | 3 years 7 days | 3 years 332 days
Granted (in shares) |  | 117,362 |
Granted, weighted average exercise price (in dollars per share) |  | $ 3.16 |
Exercised (in shares) |  |  |
Exercised, weighted average exercise price (in dollars per share) |  |  |
Forfeited (in shares) |  |  |
Forfeited, weighted average exercise price (in dollars per share) |  |  |
Expired (in shares) | (444,548) |  |
Expired, weighted average exercise price (in dollars per share) | $ 6 |  |
Total warrants (in shares) | 1,260,080 | 1,704,628 | 1,587,266
Weighted average exercise price (in dollars per share) | $ 3.84 | $ 4.40 | $ 4.44
Vested or expected to vest at December 31, 2016 (in shares) | 1,260,080 |  |
Vested or expected to vest at December 31, 2016 (in dollars per share) | $ 3.84 |  |
Vested or expected to vest at December 31, 2016 (Year) | 2 years 284 days |  |
Exercisable at December 31, 2016 (in shares) | 1,260,080 |  |
Exercisable at December 31, 2016 (in dollars per share) | $ 3.84 |  |
Exercisable at December 31, 2016 (Year) | 2 years 284 days |  |

X
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