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Note 6 - Debt - Schedule of Debt Interest Expense (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Initial Term Loan [Member] |  |  |  |
Contractual interest expense | $ 2,433,000 |  | $ 3,147,000 |
Amortization of premium and debt issuance costs | (2,060) |  | (2,659) |
Total interest expense | 373,000 |  | 488,000 |
Convertible Senior Notes 2023 [Member] |  |  |  |
Contractual interest expense | 0 | $ 1,484,000 | 0 | $ 4,453,000
Total interest expense | 0 | 1,663,000 | 0 | 4,981,000
Amortization of debt issuance costs | 0 | 179,000 | 0 | 528,000
Convertible Senior Notes 2026 [Member] |  |  |  |
Contractual interest expense | 1,284,000 | 2,954,000 | 6,488,000 | 8,861,000
Total interest expense | 1,428,000 | 3,266,000 | 7,201,000 | 9,783,000
Amortization of debt issuance costs | $ 144,000 | $ 312,000 | $ 713,000 | $ 922,000

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- Definition Amount of amortization expense attributable to debt issuance costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(8)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1F -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-1F Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482925/835-30-45-3 + Details
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