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v3.23.2

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
Statement [Line Items] |  |  |  |
Anti-dilutive securities (in shares) | 195,209 | 233,637 | 255,583 | 207,952
Warrant [Member] |  |  |  |
Statement [Line Items] |  |  |  |
Anti-dilutive securities (in shares) | 88,252 | 111,891 | 111,891 | 129,989
Share-Based Payment Arrangement, Option [Member] |  |  |  |
Statement [Line Items] |  |  |  |
Anti-dilutive securities (in shares) | 104,047 | 116,564 | 140,040 | 72,454
Unvested Restricted Stock Units [Member] |  |  |  |
Statement [Line Items] |  |  |  |
Anti-dilutive securities (in shares) | 2,910 | 5,182 | 3,652 | 5,509

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