Note 6 - Derivative Liability (Details) - USD ($) |
3 Months Ended | 12 Months Ended |
|---|---|---|
Mar. 31, 2021 |
Dec. 31, 2020 |
|
| Derivative Liability [Abstract] | ||
| Stock price | $ 6.84 | $ 7.21 |
| Risk-free interest rate | 0.92% | 0.36% |
| Expected volatility | 136.00% | 135.00% |
| Expected life (in years) | 4 years 4 months 24 days | 4 years 7 months 6 days |
| Expected dividend yield | $ 0 | $ 0 |
| Fair value of warrants | $ 362,000 | $ 383,000 |
| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Percentage rate that is indicative of an expected degree of movement against a base line index, and which is included in determining the amount of the specified guaranteed benefit obligation as of the balance sheet date. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Price of a single share of a number of saleable stocks of a company. No definition available.
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| X | ||||||||||
- Definition Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price. No definition available.
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