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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