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Note 3 - Net Income (Loss) Per Share - Schedule of Antidilutive Securities (Details) - shares | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Total potentially dilutive shares excluded from net income (loss) per share (in shares) |  | 15,489,772 | 17,221,985 | 18,823,760
Convertible Senior Notes 2026 [Member] |  |  |  |
Total potentially dilutive shares excluded from net income (loss) per share (in shares) | [1],[2] | 11,132,366 | 12,172,008 | 12,172,008
Convertible Senior Notes 2023 [Member] |  |  |  |
Total potentially dilutive shares excluded from net income (loss) per share (in shares) | [1] | 4,318,944 | 4,941,739 | 4,941,739
Share-Based Payment Arrangement, Option [Member] |  |  |  |
Total potentially dilutive shares excluded from net income (loss) per share (in shares) |  | 38,462 | 9,488 | 1,707,371
Restricted Stock Units (RSUs) [Member] |  |  |  |
Total potentially dilutive shares excluded from net income (loss) per share (in shares) |  | 0 | 98,750 | 2,642
[1] | The 2023 Notes and 2026 Notes are subject to a capped call arrangement that potentially reduces the dilutive effect as described in “Note 6 - Convertible Senior Notes”. Any potential impact of the capped call arrangement is excluded from this table.
[2] | The 2023 Notes were fully retired on November 15, 2023.

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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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