Note 3 - Investments and Fair Value Measurements - Reconciliation of Changes in Fair Value (Details) $ in Thousands	12 Months Ended
Dec. 31, 2022 USD ($)
Contingent Consideration Liability [Member]
Balance	$ 720
Fair value of financial instrument liability at inception	150
Balance	570
Fair value adjustment	(150)
Warrant Liability [Member]
Balance	0
Fair value adjustment to financial instrument liability	(11,085)
Balance	1,777
Issuance of shares upon exercise and reset of financial instrument	(6,938)
Proceeds from sale of warrants including pre-funded warrants	19,800
Seller Financed Notes Payable - Front Line Power Acquisition [Member] \| Long-Term Debt [Member]
Balance	0
Fair value of financial instrument liability at inception	26,782
Fair value adjustment to financial instrument liability	16,911
Balance	43,693
Fair value adjustment	(26,782)
Syndicated Term Note [Member] \| Long-Term Debt [Member]
Balance	825
Fair value of financial instrument liability at inception	(7,378)
Balance	536
Fair value adjustment	7,378
Issuance of shares upon exercise and reset of financial instrument	$ (7,667)

Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3).

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

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Amount of settlement of financial instrument classified as an 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://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

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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
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