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Note 2 - Basis of Presentation, Principles of Consolidation and Significant Accounting Policies - Schedule of Fair Value Measurements, Recurring and Nonrecurring (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Warrant Liability Long Term [Member] |  |
Balance | $ 1,412 | $ 8,192
Exercise of warrants |  | (52)
Change in fair value - net | (1,335) | (6,728)
Balance | 77 | 1,412
Fair Value, Recurring [Member] | Warrant Liability [Member] |  |
Fair value of warrant liability | 77 | 1,412
Fair Value, Recurring [Member] | Warrant Liability [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Fair value of warrant liability | 0 | 0
Fair Value, Recurring [Member] | Warrant Liability [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Fair value of warrant liability | 0 | 0
Fair Value, Recurring [Member] | Warrant Liability [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Fair value of warrant liability | $ 77 | $ 1,412

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- Definition Amount of gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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- Definition Amount of settlements of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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