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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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Total costs incurred from related parties related to goods produced and sold during the reporting period.

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Cost incurred from related parties during the reporting period in transporting goods and services to customers. Includes freight-out costs.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc.

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