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Note 2 - Summary of Significant Accounting Policies - Antidilutive Securities Excluded From Computation of Earnings Per Share (Details) - shares | 3 Months Ended | 6 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Total potential dilutive securities (in shares) |  | 6,605,262 | 5,154,251 | 6,481,403 | 5,307,642
Share-Based Payment Arrangement, Option [Member] |  |  |  |  |
Total potential dilutive securities (in shares) | [1] | 417,749 | 1,020,949 | 704,316 | 1,023,814
Restricted Stock Units (RSUs) [Member] |  |  |  |  |
Total potential dilutive securities (in shares) |  | 6,181,141 | 4,126,930 | 5,770,715 | 4,277,456
Warrant [Member] |  |  |  |  |
Total potential dilutive securities (in shares) |  | 6,372 | 6,372 | 6,372 | 6,372
[1] | Securities are presented on a weighted average outstanding calculation as required if the securities were dilutive.

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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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