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Note 4 - Financing Arrangements (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Senior Notes First Issuance [Member] | Senior Notes [Member]
    
Note 4 - Financing Arrangements (Details) [Line Items]    
Long-term Debt $ 100.0  
Debt Instrument, Interest Rate, Stated Percentage 6.08%  
Senior Notes Second Issuance [Member] | Senior Notes [Member]
    
Note 4 - Financing Arrangements (Details) [Line Items]    
Long-term Debt 250.0  
Debt Instrument, Interest Rate, Stated Percentage 3.375%  
Line of Credit [Member] | Senior Debt Obligations [Member]
    
Note 4 - Financing Arrangements (Details) [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity 500  
Line of Credit Facility, Amount Outstanding 187.8 85.8
Debt, Weighted Average Interest Rate 1.22%  
Line of Credit [Member] | Maximum Increase [Member]
    
Note 4 - Financing Arrangements (Details) [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity 250  
Loans Payable [Member] | Senior Debt Obligations [Member]
    
Note 4 - Financing Arrangements (Details) [Line Items]    
Long-term Debt 150.0 200.0
Line of Credit Facility, Interest Rate at Period End 1.18%  
Senior Notes [Member] | Senior Debt Obligations [Member]
    
Note 4 - Financing Arrangements (Details) [Line Items]    
Long-term Debt $ 349.7 $ 399.5