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Note 5 - Derivative Financial Instruments (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2014
Interest Rate Swap [Member]
Fair Value Hedging [Member]
London Interbank Offered Rate (LIBOR) [Member]
Mar. 06, 2014
Interest Rate Swap [Member]
Fair Value Hedging [Member]
Jun. 30, 2014
Senior Notes [Member]
Senior Notes Second Issuance [Member]
Apr. 30, 2014
Senior Notes [Member]
Note 5 - Derivative Financial Instruments (Details) [Line Items]        
Derivative, Notional Amount   $ 250    
Unsecured Debt     $ 250  
Debt Instrument, Interest Rate, Stated Percentage     2.40% 6.08%
Derivative, Variable Interest Rate 1.08%