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Note N - Equity - Summary of Warrant Activity (Details) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Total warrants (in shares) | 1,398,969 | 1,260,080 |
Weighted average exercise price (in dollars per share) | $ 3.81 | $ 3.84 |
Weighted average remaining contractual life (Year) | 2 years 18 days | 2 years 21 days | 2 years 284 days
Granted (in shares) | 1,035,000 | 138,889 |
Granted, weighted average exercise price (in dollars per share) | $ 1.50 | $ 3.60 |
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) | (145,841) |  |
Expired, weighted average exercise price (in dollars per share) | $ 6 |  |
Total warrants (in shares) | 3,780,976 | 1,398,969 | 1,260,080
Weighted average exercise price (in dollars per share) | $ 1.59 | $ 3.81 | $ 3.84
Increase due to trigger of anti-dilution provision feature (in shares) | 1,492,848 |  |
Increase due to trigger of anti-dilution provision feature (in dollars per share) | $ 1.50 |  |
Vested or expected to vest at December 31, 2018 (in shares) | 3,780,976 |  |
Vested or expected to vest at December 31, 2018 (in dollars per share) | $ 1.59 |  |
Vested or expected to vest at December 31, 2018 (Year) | 2 years 18 days |  |
Exercisable at December 31, 2018 (in shares) | 3,780,976 |  |
Exercisable at December 31, 2018 (in dollars per share) | $ 1.59 |  |
Exercisable at December 31, 2018 (Year) | 2 years 18 days |  |

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- Definition Number of warrants or rights outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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