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Note 1 - Nature of Activities and Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2023

Notes Tables

Disaggregation of Revenue [Table Text Block]

California Ethanol		For the twelve months ended December 31,
		2023				2022
Ethanol sales		$	78,403			$	165,876
Wet distiller's grains sales			21,963				50,930
Other sales			3,702				11,388
		$	104,068			$	228,194

Dairy Renewable Natural Gas		For the twelve months ended December 31,
		2023				2022
Molecule and RIN sales		$	5,455			$	208

India Biodiesel		For the twelve months ended December 31,
		2023				2022
Biodiesel sales		$	74,503			$	27,041
Other sales			2,691				1,070
		$	77,194			$	28,111

Schedule of Cash and Cash Equivalents [Table Text Block]

		As of
		December 31, 2023				December 31, 2022
Cash and cash equivalents		$	2,667			$	4,313
Restricted cash included in other current assets			289				725
Restricted cash included in other assets			3,324				1,961
Total cash, cash equivalents, and restricted cash shown in the statement of cash flows		$	6,280			$	6,999

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]

		As of
		December 31, 2023				December 31, 2022
Series B preferred (post split basis)			-				127
Common stock options and warrants			6,056				5,050
Debt with conversion feature at $30 per share of common stock			1,267				1,240
Total number of potentially dilutive shares excluded from the diluted net (loss) per share calculation			7,323				6,417

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