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Note 4 - Financing Arrangements - Outstanding Borrowings (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Senior notes $ 944,887 $ 1,305,424
Less current portion of long-term debt (354,755) 0
Senior Notes [Member]    
Senior notes 1,299,600 1,305,400
Less current portion of long-term debt (354,700) 0
Total long-term debt $ 944,900 $ 1,305,400