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Note 7 - Stockholders' Equity - Summary of Warrants Outstanding (Details) - $ / shares | Dec. 31, 2021 | Sep. 28, 2021 | Feb. 11, 2021 | Sep. 29, 2020 | Sep. 24, 2020
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Number of warrants (in shares) | 2,816,631 |  |  |  |
Weighted Average [Member] |  |  |  |  |
Exercise price (in dollars per share) | $ 5.35 |  |  |  |
Warrants 2020 [Member] |  |  |  |  |
Number of warrants (in shares) | 120,000 |  |  |  |
Exercise price (in dollars per share) | $ 5 |  |  |  |
Unit Warrant [Member] |  |  |  |  |
Number of warrants (in shares) | 2,396,631 |  |  |  |
Exercise price (in dollars per share) | $ 5 |  |  | $ 5 |
Weighted-Average Remaining Life (in years) (Year) |  |  |  | 5 years |
Representative Warrants 2020 [Member] |  |  |  |  |
Number of warrants (in shares) | 128,000 |  |  |  |
Exercise price (in dollars per share) | $ 5.5 |  |  |  | $ 5.50
Weighted-Average Remaining Life (in years) (Year) |  |  |  | 3 years 180 days |
Representative Warrants 2021 [Member] |  |  |  |  |
Number of warrants (in shares) | 72,000 |  |  |  |
Exercise price (in dollars per share) | $ 6.875 |  | $ 6.875 |  |
Weighted-Average Remaining Life (in years) (Year) |  |  | 3 years 180 days |  |
Warrants 2021 [Member] |  |  |  |  |
Number of warrants (in shares) | 100,000 |  |  |  |
Exercise price (in dollars per share) | $ 13 | $ 13 |  |  |
Weighted-Average Remaining Life (in years) (Year) |  | 5 years |  |  |
Remaining Life on Warrants Outstanding[Member] | Weighted Average [Member] |  |  |  |  |
Weighted-Average Remaining Life (in years) (Year) | 3 years 255 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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