Note 12 - Fair Value Measurements - Reconciliation of Changes in Fair Value (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2023 USD ($)
Warrant Liability [Member]
Fair value adjustment to financial instrument liability	$ (646)
Balance	1,131
Long-Term Debt [Member] | Syndicated Term Note [Member]
Balance	536
Fair value adjustment to financial instrument liability	71
Balance	607
Derivative Financial Instruments, Liabilities [Member] | Seller Financed Notes Payable - Front Line Power Acquisition [Member]
Balance	43,693
Fair value adjustment to financial instrument liability	1,093
Balance	$ 44,785