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Note 3 - Financing Arrangements - Outstanding Borrowings (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Long-term debt $ 977,702 $ 1,326,107
Less current portion of long-term debt (500,000) (249,961)
Total long-term debt 977,700 1,326,100
Senior Notes [Member]    
Long-term debt 699,000 948,200
Revolving Credit Facility [Member]    
Long-term debt $ 778,700 $ 627,900