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Note 3 - Basis of Presentation and Summary of Significant Accounting Policies - Outstanding Dilutive Securities (Details) - shares | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Anti-dilutive securities (in shares) | 10,401,142 | 11,493,316
Warrant [Member] |  |
Anti-dilutive securities (in shares) | 6,499,469 | 9,100,112
Share-based Payment Arrangement, Option [Member] |  |
Anti-dilutive securities (in shares) | 3,626,223 | 2,240,204
Unvested Restricted Stock Units [Member] |  |
Anti-dilutive securities (in shares) | 275,450 | 153,000

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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