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Note 13 - Income Tax (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Deferred Tax Liabilities, Net, Total	$ 810	$ (0)
Undistributed Earnings of Foreign Subsidiaries	2,500	$ 8,900
Alcohol and Cellulosic Biofuel Credit Carryforward [Member]
Tax Credit Carryforward, Amount	1,500
Carbon Oxide Sequestration Credit Carryforward [Member]
Tax Credit Carryforward, Amount	5,800
Domestic Tax Authority [Member]
Operating Loss Carryforwards	$ 231,000
Domestic Tax Authority [Member] | Minimum [Member]
Operating Loss Carryforwards, Expiration Date	Dec. 31, 2027
Domestic Tax Authority [Member] | Maximum [Member]
Operating Loss Carryforwards, Expiration Date	Dec. 31, 2038
State and Local Jurisdiction [Member]
Operating Loss Carryforwards	$ 300,000
State and Local Jurisdiction [Member] | Minimum [Member]
Operating Loss Carryforwards, Expiration Date	Dec. 31, 2027
State and Local Jurisdiction [Member] | Maximum [Member]
Operating Loss Carryforwards, Expiration Date	Dec. 31, 2042

X

- Definition

Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences without jurisdictional netting.

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