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v3.24.1

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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