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Note 8 - Stockholders' Equity - Summary of Warrants (Details) - $ / shares | Feb. 11, 2021 | Dec. 31, 2020 | Sep. 29, 2020 | Sep. 24, 2020 | Jun. 26, 2020
--- | --- | --- | --- | --- | ---
Number of warrants (in shares) |  | 3,600,337 |  |  |
Weighted Average [Member] |  |  |  |  |
Exercise price (in dollars per share) |  | $ 4.84 |  |  |
Series I Warrants [Member] |  |  |  |  |
Number of warrants (in shares) |  | 62,626 |  |  |
Exercise price (in dollars per share) |  | $ 5.00 |  |  |
June 2020 Warrants [Member] |  |  |  |  |
Number of warrants (in shares) |  | 120,000 |  |  |
Exercise price (in dollars per share) |  | $ 5.00 | $ 5.00 |  | $ 10.00
Weighted-Average Remaining Life (excluding Pre-Funded Warrants) (years) (Year) |  |  |  |  | 5 years
Pre-Funded Warrants [Member] |  |  |  |  |
Number of warrants (in shares) |  | 126,042 |  |  |
Exercise price (in dollars per share) |  | $ 0.01 | $ 0.01 | $ 0.01 |
Unit, Conversion and Management Warrants [Member] |  |  |  |  |
Number of warrants (in shares) |  | 3,163,669 |  |  |
Exercise price (in dollars per share) |  | $ 5.00 |  |  |
Representative Warrants [Member] |  |  |  |  |
Number of warrants (in shares) |  | 128,000 |  |  |
Exercise price (in dollars per share) | $ 6.875 | $ 5.50 |  | $ 5.50 |
Weighted-Average Remaining Life (excluding Pre-Funded Warrants) (years) (Year) |  |  |  | 3 years |
Outstanding Warrants Excluding Pre-Funded Warrants [Member] | Weighted Average [Member] |  |  |  |  |
Weighted-Average Remaining Life (excluding Pre-Funded Warrants) (years) (Year) |  | 4 years 8 months 12 days |  |  |

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- Definition Period between issuance and expiration of outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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