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Note 20 - Related Party Transactions - Related Party Balance Sheet Accounts (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Accounts receivable, related parties | [1] | $ 15,897 | $ 16,459
Prepaid expenses – related parties |  | 12 | 12
Related Party [Member] |  |  |
Accounts receivable, related parties |  | 1 | 6
Prepaid expenses – related parties |  | 12 | 12
Natural gas and fuel purchases |  | 42 | 7,799
Accrued liabilities, related parties |  | 0 | 1
Related Party [Member] | Administrative Servicesand Other [Member] |  |  |
Prepaid expenses – related parties |  | 12 | 12
Related Party [Member] | Fuel [Member] |  |  |
Natural gas and fuel purchases |  | 0 | 7,788
Related Party [Member] | Travel and Administrative Services [Member] |  |  |
Natural gas and fuel purchases |  | 42 | 11
Accrued liabilities, related parties |  | 0 | 1
Related Party [Member] | Biodiesel [Member] |  |  |
Accounts receivable, related parties |  | $ 1 | $ 6
[1] | Exclusive of the BTC of $11,381 and $8,970, respectively, and net of allowances for bad debt of $55 and $48, respectively, as of the dates noted.

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