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Note 3 - Basis of Presentation and Summary of Significant Accounting Policies - Outstanding Dilutive Securities (Details) - shares | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2022 | Dec. 31, 2021
Anti-dilutive securities (in shares) | 195,209 | 233,637 | 255,583 | 207,952
Warrant [Member] |  |  |  |
Anti-dilutive securities (in shares) | 88,252 | 111,891 | 111,891 | 129,989
Share-Based Payment Arrangement, Option [Member] |  |  |  |
Anti-dilutive securities (in shares) | 104,047 | 116,564 | 140,040 | 72,454
Unvested Restricted Stock Units [Member] |  |  |  |
Anti-dilutive securities (in shares) | 2,910 | 5,182 | 3,652 | 5,509

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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 -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482662/260-10-50-1 + Details
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