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Note 4 - Financing Arrangements (Details) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Mar. 31, 2014
Senior Notes [Member]      
Note 4 - Financing Arrangements (Details) [Line Items]      
Unsecured Debt     $ 100.0
Debt Instrument, Interest Rate, Stated Percentage     6.08%
Senior Notes First Issuance [Member] | Senior Notes [Member]      
Note 4 - Financing Arrangements (Details) [Line Items]      
Unsecured Debt $ 250.0    
Debt Instrument, Interest Rate, Stated Percentage 3.375%    
Senior Notes Second Issuance [Member] | Senior Notes [Member]      
Note 4 - Financing Arrangements (Details) [Line Items]      
Unsecured Debt $ 250.0    
Debt Instrument, Interest Rate, Stated Percentage 2.40%    
Senior Notes Third Issuance [Member] | Senior Notes [Member]      
Note 4 - Financing Arrangements (Details) [Line Items]      
Unsecured Debt $ 250.0    
Debt Instrument, Interest Rate, Stated Percentage 3.85%    
Senior Debt Obligations [Member]      
Note 4 - Financing Arrangements (Details) [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity, Increase $ 250.0    
Senior Debt Obligations [Member] | Line of Credit [Member]      
Note 4 - Financing Arrangements (Details) [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity 500.0    
Long-term Line of Credit $ 141.0 $ 183.0  
Debt, Weighted Average Interest Rate 1.14%