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Note 4 - Financing Arrangements - Outstanding Borrowings (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Long-term debt $ 1,483,804 $ 1,326,107
Less current portion of long-term debt 0 (249,961)
Total long-term debt 1,483,800 1,326,100
Senior Notes [Member]    
Long-term debt 698,600 948,200
Revolving Credit Facility [Member]    
Long-term debt $ 785,200 $ 627,900