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Note 2 - Significant Accounting Policies and Basis of Presentation (Details Textual) $ in Thousands	3 Months Ended										12 Months Ended
	Dec. 31, 2023 USD ($)		Sep. 30, 2023 USD ($)	Jun. 30, 2023 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	[1]	Sep. 30, 2022 USD ($)	Jun. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Revenue from Contract with Customer, Excluding Assessed Tax	$ 92,009	[1]	$ 116,752	$ 85,308	$ 74,181	$ 117,816		$ 118,141	$ 117,796	$ 42,261	$ 368,250	$ 396,014	$ 321,386
Environmental Assets [Member]
Property, Plant and Equipment, Useful Life (Year)	27 years										27 years
Biodiesel [Member] | Two Customers [Member]
Revenue from Contract with Customer, Excluding Assessed Tax											$ 127,763	$ 107,898
Biodiesel [Member] | Three Customers [Member]
Revenue from Contract with Customer, Excluding Assessed Tax													$ 133,231
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Chemicals [Member]
Number Of Major Customers											0	0	0
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Biodiesel [Member]
Number Of Major Customers											2	2	3
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Biodiesel [Member] | Two Customers [Member]
Concentration Risk, Percentage											35.00%	27.00%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Biodiesel [Member] | Three Customers [Member]
Concentration Risk, Percentage													41.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Biodiesel [Member] | Two Customers [Member]
Concentration Risk, Percentage											0.20%	2.00%
[1] The fourth quarter of 2019 includes the retroactive reinstatement of the BTC in revenue and gross profit (see Note 3 for further information).

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