Note 4 - Financing Arrangements (Detail) - Outstanding Borrowings (USD $)	Sep. 30, 2012	Dec. 31, 2011
Less current portion of long-term debt	$ (100,000,000)	$ (50,000,000)
Total long-term debt	544,904,000	699,177,000
Line of Credit [Member] | Senior Debt Obligations [Member]
Senior revolving line of credit	45,400,000	99,800,000
Loans Payable [Member] | Senior Debt Obligations [Member]
Long-term debt	200,000,000	200,000,000
Senior Notes [Member] | Senior Debt Obligations [Member]
Long-term debt	$ 399,500,000	$ 449,400,000