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Note 7 - Revenue and Accounts Receivable - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
California Ethanol [Member]
Revenues	$ 37,748	$ 36,089
California Ethanol [Member] | Ethanol Sales [Member]
Revenues	28,059	25,385
California Ethanol [Member] | Wet Distillers Grains [Member]
Revenues	8,001	9,213
California Ethanol [Member] | Product and Service, Other [Member]
Revenues	1,688	1,491
California Dairy Renewable Natural Gas [Member]
Revenues	2,443	3,792
California Dairy Renewable Natural Gas [Member] | Gas Sales [Member]
Revenues	259	245
California Dairy Renewable Natural Gas [Member] | LCFS Credit Sales [Member]
Revenues	1,160	1,188
California Dairy Renewable Natural Gas [Member] | RIN Sales [Member]
Revenues	$ 1,024	$ 2,359

X

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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