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Note R - Equity - Summary of Warrant Activity (Details) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Outstanding, warrants (in shares) | 423,559 | 472,622 |
Outstanding, weighted average exercise price, warrants (in dollars per share) | $ 12.80 | $ 12.72 |
Outstanding, weighted average remaining contractual life, warrants (Year) | 4 years 175 days | 3 years 343 days | 2 years 18 days
Granted, warrants (in shares) |  | 250,000 |
Granted, weighted average exercise price, warrants (in dollars per share) |  | $ 12 |
Exercised, warrants (in shares) |  |  |
Exercised, weighted average exercise price, warrants (in dollars per share) |  |  |
Forfeited, warrants (in shares) |  |  |
Forfeited, weighted average exercise price, warrants (in dollars per share) |  |  |
Expired, warrants (in shares) | (54,066) | (299,063) |
Expired, weighted average exercise price, warrants (in dollars per share) | $ 6.86 | $ 12 |
Granted, warrants (in shares) |  | 250,000 |
Granted, weighted average exercise price, warrants (in dollars per share) |  | $ 12 |
Increase due to trigger of anti-dilution provision feature, warrants (in shares) | 27,244 |  |
Increase due to trigger of anti-dilution provision feature, weighted average exercise price, warrants (in dollars per share) | $ 5.20 |  |
Exercised, warrants (in shares) |  |  |
Exercised, weighted average exercise price, warrants (in dollars per share) |  |  |
Outstanding, warrants (in shares) | 4,689,387 | 423,559 | 472,622
Outstanding, weighted average exercise price, warrants (in dollars per share) | $ 6.04 | $ 12.80 | $ 12.72
Public Offering Warrants [Member] |  |  |
Granted, warrants (in shares) | 4,264,313 |  |
Granted, weighted average exercise price, warrants (in dollars per share) | $ 5.20 |  |
Exercised, warrants (in shares) | 284,538 |  |
Exercised, weighted average exercise price, warrants (in dollars per share) | $ 5.20 |  |
Granted, warrants (in shares) | 4,264,313 |  |
Granted, weighted average exercise price, warrants (in dollars per share) | $ 5.20 |  |
Exercised, warrants (in shares) | (284,538) |  |
Exercised, weighted average exercise price, warrants (in dollars per share) | $ 5.20 |  |
Pre-Funded Warrants [Member] |  |  |
Granted, warrants (in shares) | 512,500 |  |
Granted, weighted average exercise price, warrants (in dollars per share) | $ 0.08 |  |
Exercised, warrants (in shares) | 512,500 |  |
Exercised, weighted average exercise price, warrants (in dollars per share) | $ 0.08 |  |
Granted, warrants (in shares) | 512,500 |  |
Granted, weighted average exercise price, warrants (in dollars per share) | $ 0.08 |  |
Exercised, warrants (in shares) | (512,500) |  |
Exercised, weighted average exercise price, warrants (in dollars per share) | $ 0.08 |  |
Other Warrants [Member] |  |  |
Granted, warrants (in shares) | 434,375 |  |
Granted, weighted average exercise price, warrants (in dollars per share) | $ 9.25 |  |
Exercised, warrants (in shares) | 121,500 |  |
Exercised, weighted average exercise price, warrants (in dollars per share) | $ 12 |  |
Granted, warrants (in shares) | 434,375 |  |
Granted, weighted average exercise price, warrants (in dollars per share) | $ 9.25 |  |
Exercised, warrants (in shares) | (121,500) |  |
Exercised, weighted average exercise price, warrants (in dollars per share) | $ 12 |  |

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