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Note 4 - Financing Arrangements - Outstanding Borrowings (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Long-term debt $ 950,558 $ 986,278
Senior Debt Obligations [Member] | Line of Credit [Member]    
Long-term Debt 109,100 139,000
Senior Debt Obligations [Member] | Senior Notes [Member]    
Long-term Debt $ 841,500 $ 847,300