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Note 6 - Fair Value of Financial Instruments - Changes in Derivative Liabilities (Details) - USD ($) $ in Thousands | 3 Months Ended
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Jun. 30, 2025 | Mar. 31, 2025 | Jun. 30, 2024 | Mar. 31, 2024
Measurement at December 31, 2024 | $ 101 | $ 224 | $ 411 | $ 597
Change in fair value | 20 | (123) | (42) | (186)
Measurement at March 31, 2025 | 121 | 101 | 369 | 411
Notes Warrants [Member] |  |  |  |
Measurement at December 31, 2024 | 90 | 197 | 362 | 334
Change in fair value | 17 | (107) | (24) | 28
Measurement at March 31, 2025 | 107 | 90 | 338 | 362
Additional Warrants [Member] |  |  |  |
Measurement at December 31, 2024 | 11 | 27 | 49 | 263
Change in fair value | 3 | (16) | (18) | (214)
Measurement at March 31, 2025 | $ 14 | $ 11 | $ 31 | $ 49

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- Definition Amount of gain (loss) recognized in income from derivative asset (liability) after deduction of derivative liability (asset), measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Fair value of financial instrument classified as derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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