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Note I - Stockholders' Equity - Assumptions Used to Value Warrants at Grant Date (Details) | 1 Months Ended | 11 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2019 $ / shares shares | Nov. 30, 2019 $ / shares shares | Dec. 31, 2018 shares | Dec. 17, 2019 $ / shares
Fair Value of Common Stock, employee stock options (in dollars per share) | $ 0.84 |  |  | $ 0.42
Share-based Payment Arrangement, Option [Member] |  |  |  |
Fair Value of Common Stock, employee stock options (in dollars per share) | $ 1.28 |  |  |
Volatility, employee stock options, minimum |  | 91.80% |  |
Volatility, employee stock options, maximum | 102.00% | 102.30% |  |
Dividend yield, employee stock options | 0.00% | 0.00% |  |
Risk-free interest rate, employee stock options, minimum | 1.53% | 1.68% |  |
Risk-free interest rate, employee stock options, maximum | 1.63% | 1.53% |  |
Weighted average fair value of options granted, employee stock options (in dollars per share) | $ 0.64 | $ 0.72 |  |
Number of options granted (in shares) | shares | 592,358 | 592,358 |  |
Minimum [Member] | Share-based Payment Arrangement, Option [Member] |  |  |  |
Fair Value of Common Stock, employee stock options (in dollars per share) |  | $ 1.07 |  |
Expected Term, employee stock options (Year) | 1 year | 1 year 36 days |  |
Volatility, employee stock options, minimum | 92.00% |  |  |
Exercise Price, employee stock options (in dollars per share) | $ 1.04 | $ 1.04 |  |
Maximum [Member] | Share-based Payment Arrangement, Option [Member] |  |  |  |
Fair Value of Common Stock, employee stock options (in dollars per share) |  | $ 1.60 |  |
Expected Term, employee stock options (Year) | 2 years 36 days | 2 years 80 days |  |
Exercise Price, employee stock options (in dollars per share) | $ 2.09 | $ 2.09 |  |
The 2016 Warrants [Member] |  |  |  |
Number of shares underlying warrants exercised (in shares) | shares | 1,592,775 | 1,592,775 |  |
The 2019 Warrants [Member] |  |  |  |
Weighted average fair value of securities granted, warrants (in dollars per share) |  | $ 0.22 |  |
Number of shares underlying warrants exercised (in shares) | shares | 1,084,171 | 1,749,171 |  |
Measurement Input, Share Price [Member] | The 2016 Warrants [Member] | Minimum [Member] |  |  |  |
Warrants, measurement input |  | 0.36 |  |
Measurement Input, Share Price [Member] | The 2016 Warrants [Member] | Maximum [Member] |  |  |  |
Warrants, measurement input |  | 0.83 |  |
Measurement Input, Share Price [Member] | The 2019 Warrants [Member] |  |  |  |
Warrants, measurement input |  | 0.33 |  |
Measurement Input, Expected Term [Member] | The 2016 Warrants [Member] | Minimum [Member] |  |  |  |
Warrants, measurement input |  | 0.2 |  |
Measurement Input, Expected Term [Member] | The 2016 Warrants [Member] | Maximum [Member] |  |  |  |
Warrants, measurement input |  | 0.5 |  |
Measurement Input, Expected Term [Member] | The 2019 Warrants [Member] |  |  |  |
Warrants, measurement input |  | 4.9 |  |
Measurement Input, Price Volatility [Member] | The 2016 Warrants [Member] | Minimum [Member] |  |  |  |
Warrants, measurement input |  | 0.86 |  |
Measurement Input, Price Volatility [Member] | The 2016 Warrants [Member] | Maximum [Member] |  |  |  |
Warrants, measurement input |  | 1 |  |
Measurement Input, Price Volatility [Member] | The 2019 Warrants [Member] |  |  |  |
Warrants, measurement input |  | 0.83 |  |
Measurement Input, Expected Dividend Rate [Member] | The 2016 Warrants [Member] |  |  |  |
Warrants, measurement input |  | 0 |  |
Measurement Input, Expected Dividend Rate [Member] | The 2019 Warrants [Member] |  |  |  |
Warrants, measurement input |  | 0 |  |
Measurement Input, Exercise Price [Member] | The 2016 Warrants [Member] |  |  |  |
Warrants, measurement input |  | 2.55 |  |
Measurement Input, Exercise Price [Member] | The 2019 Warrants [Member] |  |  |  |
Warrants, measurement input |  | 0.5 |  |
Measurement Input, Risk Free Interest Rate [Member] | The 2016 Warrants [Member] | Minimum [Member] |  |  |  |
Warrants, measurement input |  | 0.0188 |  |
Measurement Input, Risk Free Interest Rate [Member] | The 2016 Warrants [Member] | Maximum [Member] |  |  |  |
Warrants, measurement input |  | 0.0209 |  |
Measurement Input, Risk Free Interest Rate [Member] | The 2019 Warrants [Member] |  |  |  |
Warrants, measurement input |  | 0.023 |  |

X
- Definition The weighted average grant-date fair value of warrants granted during the reporting period. + References No definition available. + Details
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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + 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)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Agreed-upon price for the exchange of the underlying asset relating to the share-based payment award. + References No definition available. + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the maximum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References No definition available. + Details
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- Definition The estimated measure of the minimum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References No definition available. + Details
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- Definition The maximum risk-free interest rate assumption that is used in valuing an option on its own shares. + References No definition available. + Details
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- Definition The minimum risk-free interest rate assumption that is used in valuing an option on its own shares. + References No definition available. + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.D.2) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 + Details
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- Definition Value of input used to measure outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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