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Note 1 - Nature of Activities and Summary of Significant Accounting Policies (Details Textual) $ in Thousands	1 Months Ended			3 Months Ended		12 Months Ended
	Feb. 28, 2023 USD ($)	May 31, 2022 USD ($)	Oct. 31, 2020 USD ($)	Dec. 31, 2022 USD ($)	Jun. 30, 2022 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2019 USD ($)
Number of Operating Segments						3
U.S. Department of Food And Agriculture Forest Service [Member]
Awarded Grants						$ 245
Proceeds from Grantors						166,000
LCFPP [Member]
Awarded Grants						4,200
Proceeds from Grantors						3,800
CDFAs[Member]
Awarded Grants			$ 7,800					$ 3,200
Proceeds from Grantors						6,200
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
California Energy Commission Grant for Solar Microgrid, DSC and Battery Backup System [Member]
Awarded Grants						8,000
Proceeds from Grantors						4,400
Matching Contribution						1,600
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
USDA Bioguel Producer Program [Member]
Proceeds from Grantors					$ 14,200
Matching Contribution		$ 2,400
California Energy Commission Grant for Mechanical Vapor Recompression System [Member]
Awarded Grants						6,000
Proceeds from Grantors						0
Matching Contribution						5,300
CEC PG&E Pipeline Interconnect [Member]
Proceeds from Grantors	$ 5,000
PG&E SEM Incentive Program [Member]
Proceeds from Grantors				$ 374
Other Receivable [Member]
Accumulated Deferred Investment Tax Credit						55,200
India Biodiesel [Member] | Other Current Assets [Member]
Tax Credit Carryforward, Amount						1,600
Nontrade Receivables, Current						69
Accounts and Other Receivables, Net, Current						$ 1,200

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