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Note 4 - Financing Arrangements - Outstanding Borrowings (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Long-term debt $ 1,032,303 $ 1,326,107
Less current portion of long-term debt (500,000) (249,961)
Total long-term debt 1,032,300 1,326,100
Senior Notes [Member]    
Long-term debt 698,800 948,200
Revolving Credit Facility [Member]    
Long-term debt $ 833,500 $ 627,900