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Note 20 - Related Party Transactions - Related Party Income Statement Accounts (Details) - Related Party [Member] - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Revenues, related parties | $ 22 | $ 459 | $ 1,261
Cost of goods sold, related parties | (315) | 5,425 | 16,593
Distribution, related parties | 176 | 174 | 176
Selling, general, and administrative expenses, related parties | 616 | 611 | 649
Biodeisel, Petrodiesel Blends, and Other Petroleum Products [Member] |  |  |
Revenues, related parties | 22 | 459 | 1,261
Cost of goods sold, related parties | 0 | 5,425 | 5,233
Natural Gas Purchases [Member] |  |  |
Cost of goods sold, related parties | (315) | 0 | 11,360
Distribution Related [Member] |  |  |
Distribution, related parties | 176 | 174 | 176
Commodity Trading Advisory Fees [Member] |  |  |
Selling, general, and administrative expenses, related parties | 308 | 307 | 308
Travel and Administrative Services [Member] |  |  |
Selling, general, and administrative expenses, related parties | 188 | 184 | 221
Income Tax Consulting Services and Other [Member] |  |  |
Cost of goods sold, related parties | $ 120 | $ 120 | $ 120

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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. 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