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Note 1 - Nature of Operations and Summary of Significant Accounting Policies - Activity in the Allowance for Credit Losses (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Affiliate credit loss impairment expense | $ 0 | $ 0 | $ 400
Trade Accounts Receivable [Member] |  |  |
Balance | 14,060 | 74,404 | 73,316
Affiliate credit loss impairment expense | 3,305 | 414 | 1,238
Write off of due from affiliate in connection with the acquisition | (1,484) |  | (406)
Other | (457) | (1,080) | 256
Acquisition of Sonatide joint venture |  | (59,678) |
Recoveries | 490 |  |
Balance | $ 15,914 | $ 14,060 | $ 74,404

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