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Note 4 - Financing Arrangements - Outstanding Borrowings (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Long-term debt $ 1,195,309 $ 1,261,738
Less current portion of long-term debt (249,844) 0
Total long-term debt 1,195,300 1,261,700
Senior Notes [Member]    
Long-term debt 947,600 947,000
Revolving Credit Facility [Member]    
Long-term debt $ 497,500 $ 314,700