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Note 5 - Warrants (Details Textual) - USD ($) | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Sep. 30, 2022 | Jun. 30, 2022 | Aug. 31, 2021 | Apr. 30, 2021
Class of Warrant or Right, Outstanding (in shares) | 3,302,797 | 3,120,147 |  |  |  |
Share-Based Payment Arrangement, Expense | $ 2,275,000 | $ 2,373,000 |  |  |  |
Warrants Issued in June 2018 and Expiring December 22, 2023 [Member] |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  | 118,372 |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  | $ 12.12 |  |  |  |
Warrants Issued in June 2018 and Expiring June 21, 2023 [Member] |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  | 5,464 |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  | $ 13.92 |  |  |  |
Warrants Issued in July 2017 for Consulting with Exercise Price of 14.46 [Member] |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  | 16,667 |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  | $ 14.46 |  |  |  |
Warrants Issued in July 2017 for Consulting with Exercise Price 18.00 [Member] |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  | 8,334 |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  | $ 18.00 |  |  |  |
Equity Classified Warrants [Member] |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  | 396,502 | 250,000 | 50,000 | 250,000 | 71,500
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  | $ 1.24 | $ 1.49 | $ 3.08 | $ 3.63
Warrants and Rights Outstanding, Term (Year) |  |  | 10 years | 10 years | 10 years | 5 years
Class of Warrant or Right, Outstanding (in shares) | 646,501 | 396,502 |  |  |  |
Class of Warrant or Right, Vested and Exercisable (in shares) | 400,859 | 186,560 |  |  |  |
Share-Based Payment Arrangement, Expense | $ 398,000 | $ 516,000 |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $ 437,000 |  |  |  |  |

X
- Definition Number of warrants or rights vested and exercisable. + References No definition available. + Details
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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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X
- 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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21475-112644 + Details
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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 https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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