Note 12 - Fair Value Measurements - Reconciliation of Changes in Fair Value (Details) $ in Thousands	9 Months Ended
Sep. 30, 2022 USD ($)
Warrant Liability [Member]
Balance	$ 0
Issuance of shares upon exercise and reset of instrument (instrument includes reference price of $0.40 per share at September 30, 2022)	(6,939)
Fair value adjustments to Financial instrument liability	(15,194)
Balance	5,492
Fair value of warrant liability at inception	27,625
Syndicated Term Note [Member] \| Long-Term Debt [Member]
Balance	825
Issuance of shares upon exercise and reset of instrument (instrument includes reference price of $0.40 per share at September 30, 2022)	(4,361)
Fair value adjustments to Financial instrument liability	4,380
Balance	844
Seller Financed Notes Payable - Front Line Power Acquisition [Member] \| Derivative Financial Instruments, Liabilities [Member]
Balance	0
Fair value adjustments to Financial instrument liability	13,303
Balance	40,085
Fair value of financial instrument liability at inception	$ 26,782

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 issuances 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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
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