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Note 1 - Nature of Activities and Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Accounts Receivable, Allowance for Credit Loss | $ 36 |
Nontrade Receivables, Current | 12,300 | $ 0
Tax Credit Income | 12,300 | $ 55,200
Other Current Assets [Member] | India Biodiesel [Member] |  |
Tax Credit Carryforward, Amount | 2,100 |
Nontrade Receivables, Current | $ 300 |

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