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Note 1 - Nature of Activities and Summary of Significant Accounting Policies (Details Textual) $ in Thousands, gal in Millions	1 Months Ended		3 Months Ended		12 Months Ended
	May 31, 2022 USD ($)	Oct. 31, 2020 USD ($)	Dec. 31, 2022 USD ($)	Jun. 30, 2022 USD ($)	Dec. 31, 2022 USD ($) gal	Dec. 31, 2021 USD ($)
Cost of Goods and Services Sold, Total					$ 262,048	$ 204,010
Accounts Receivable, Allowance for Credit Loss, Ending Balance			$ 0		0	1,404
Awarded Grants					8,000
Proceeds from Grantors					3,900
Matching Contribution					1,600
LCFPP [Member]
Awarded Grants					4,200
Proceeds from Grantors					3,800
CDFAs[Member]
Awarded Grants		$ 7,800			3,200
Proceeds from Grantors					2,400
CEC [Member]
Matching Contribution					7,900
Actual Expenses Incurred					5,000
Unearned Grant Proceeds					1,700	1,700
CEC [Member] | Maximum [Member]
Awarded Grants					5,000
CAL FIRE Business and Workforce Development Grant Program [Member]
Awarded Grants	$ 2,000
Proceeds from Grantors					0
Matching Contribution	5,800
CAL Fire [Member]
Awarded Grants	500
Proceeds from Grantors					0
US Forest Service [Member]
Awarded Grants	642
Matching Contribution	$ 2,400
USDA Bioguel Producer Program [Member]
Proceeds from Grantors				$ 14,200
AAFK Plan [Member]
Awarded Grants					6,000
Matching Contribution					5,300
PG&E SEM Incentive Program [Member]
Proceeds from Grantors			$ 374
Accounts Receivables [Member]
Accounts Receivable, Allowance for Credit Loss, Ending Balance						1,400
California Triennial Obligation on GHG Emissions [Member]
Cost of Goods and Services Sold, Total					300	5,000
California Triennial Obligation on GHG Emissions [Member] | Previously Reported [Member]
Cost of Goods and Services Sold, Total						$ 3,200
U.S. Department of Food And Agriculture Forest Service [Member]
Awarded Grants					245
Proceeds from Grantors					$ 166
Kakinada Plant [Member]
GallonPerYear (Gallon) | gal					50

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