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Note I - Stockholders' Equity - Assumptions Used to Value Liability Classified Warrants Exercised (Details) - The 2019 Warrants [Member] | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 $ / shares shares | Nov. 30, 2019 shares
Number of shares underlying warrants exercised (in shares) | 1,084,171 | 1,749,171
Warrants Liabilities Exercised [Member] |  |
Weighted average fair value of warrants exercised (in dollars per share) | $ / shares | $ 0.98 |
Number of shares underlying warrants exercised (in shares) | 665,000 |
Measurement Input, Share Price [Member] |  |
Warrants, measurement input |  | 0.33
Measurement Input, Share Price [Member] | Warrants Liabilities Exercised [Member] | Minimum [Member] |  |
Warrants, measurement input | 0.83 |
Measurement Input, Share Price [Member] | Warrants Liabilities Exercised [Member] | Maximum [Member] |  |
Warrants, measurement input | 1.42 |
Measurement Input, Expected Term [Member] |  |
Warrants, measurement input |  | 4.9
Measurement Input, Expected Term [Member] | Warrants Liabilities Exercised [Member] | Minimum [Member] |  |
Warrants, measurement input | 4.2 |
Measurement Input, Expected Term [Member] | Warrants Liabilities Exercised [Member] | Maximum [Member] |  |
Warrants, measurement input | 4.3 |
Measurement Input, Price Volatility [Member] |  |
Warrants, measurement input |  | 0.83
Measurement Input, Price Volatility [Member] | Warrants Liabilities Exercised [Member] | Minimum [Member] |  |
Warrants, measurement input | 0.86 |
Measurement Input, Price Volatility [Member] | Warrants Liabilities Exercised [Member] | Maximum [Member] |  |
Warrants, measurement input | 87 |
Measurement Input, Expected Dividend Rate [Member] |  |
Warrants, measurement input |  | 0
Measurement Input, Expected Dividend Rate [Member] | Warrants Liabilities Exercised [Member] |  |
Warrants, measurement input | 0 |
Measurement Input, Exercise Price [Member] |  |
Warrants, measurement input |  | 0.5
Measurement Input, Exercise Price [Member] | Warrants Liabilities Exercised [Member] |  |
Warrants, measurement input | 0.5 |
Measurement Input, Risk Free Interest Rate [Member] |  |
Warrants, measurement input |  | 0.023
Measurement Input, Risk Free Interest Rate [Member] | Warrants Liabilities Exercised [Member] | Minimum [Member] |  |
Warrants, measurement input | 1.38 |
Measurement Input, Risk Free Interest Rate [Member] | Warrants Liabilities Exercised [Member] | Maximum [Member] |  |
Warrants, measurement input | 1.73 |

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- Definition The weighted average grant-date fair value of warrants exercised 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 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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