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Note 11 - Subsequent Events (Details Textual) - USD ($) $ / shares in Units, $ in Millions | Jan. 19, 2022 | Feb. 11, 2021 | Sep. 29, 2020
--- | --- | --- | ---
Stock Issued During Period, Shares, New Issues (in shares) |  | 1,644,000 |
Proceeds from Issuance or Sale of Equity, Total |  |  | $ 11.2
Subsequent Event [Member] | Pre-Funded Warrants [Member] |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | 2,360,000 |  |
Subsequent Event [Member] | Warrants Issued in Private Placement [Member] |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | 3,067,484 |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ 3.26 |  |
Warrants and Rights Outstanding, Term (Year) | 5 years |  |
Subsequent Event [Member] | Private Placement [Member] |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | 707,484 |  |
Proceeds from Issuance or Sale of Equity, Total | $ 9.2 |  |

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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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21475-112644 + Details
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- Definition The cash inflow from the issuance of common stock, preferred stock, treasury stock, stock options, and other types of equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3255-108585 + 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 http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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