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Note 1 - Nature of Activities and Summary of Significant Accounting Policies (Details Textual) gal in Millions	1 Months Ended				3 Months Ended			6 Months Ended	12 Months Ended
	Jul. 31, 2023 USD ($)	Apr. 30, 2023 USD ($)	May 31, 2022 USD ($)	Oct. 31, 2020 USD ($)	Jun. 30, 2023 USD ($) MMBTU	Mar. 31, 2023 USD ($) gal	Dec. 31, 2022 USD ($)	Jun. 30, 2023 USD ($) MMBTU	Dec. 31, 2022 USD ($)
Renewable Natural Gas in Storage (Millions of British Thermal Unit) | MMBTU					86,700			86,700
Low Carbon Fuel Standard Credits, Per Metric Ton					$ 76			$ 76
Low Carbon Fuel Standard Credits, Per D3 Cellulosic RIN					2.80			2.80
Low Carbon Fuel Standard Credits, Estimated Market Value Per MMBtu					68.22			68.22
U.S. Department of Food And Agriculture Forest Service [Member]
Awarded Grants								245,000
Proceeds from Grantors								245,000
LCFPP [Member]
Awarded Grants								4,200,000
Proceeds from Grantors								3,800,000
CDFAs[Member]
Awarded Grants				$ 7,800,000
Proceeds from Grantors								4,400,000
CEC [Member]
Awarded Grants								8,000,000.0
Proceeds from Grantors								4,200,000
Matching Contribution								1,600,000
Actual Expenses Incurred								5,000,000.0
Unearned Grant Proceeds								1,700,000	$ 1,700,000
CEC [Member] | Maximum [Member]
Awarded Grants								5,000,000.0
CEC [Member] | Minimum [Member]
Matching Contribution								7,900,000
CAL FIRE Business and Workforce Development Grant Program [Member]
Awarded Grants			$ 2,000,000
Proceeds from Grantors									0
Matching Contribution			5,800,000
CAL Fire [Member]
Awarded Grants			500,000
Proceeds from Grantors									$ 0
US Forest Service [Member]
Awarded Grants			642,000
Matching Contribution			$ 2,400,000
AAFK Plan [Member]
Awarded Grants								6,000,000.0
Matching Contribution								5,300,000
PG&E SEM Incentive Program [Member]
Proceeds from Grantors							$ 374,000	$ 27,000
CEC PG&E Pipeline Interconnect [Member]
Proceeds from Grantors						$ 5,000,000
Kakinada Plant [Member]
GallonPerYear (Gallon) | gal						50
Amount of Biodiesel, Offer To Ship		$ 34,000,000.0
Revenue from Contract with Customer, Excluding Assessed Tax					$ 32,800,000
Kakinada Plant [Member] | Subsequent Event [Member]
Amount of Biodiesel, Offer To Ship	$ 20,000,000.0

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