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Note 11 - Revolving Credit Facility and Letter of Credit Facilities (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2014
Jul. 30, 2014
Subsequent Event [Member]
Unsecured Revolving Credit Facility [Member]
Jun. 30, 2014
Four Committed Letter Of Credit [Member]
Letter of Credit [Member]
Jun. 30, 2014
Unsecured Revolving Credit Facility [Member]
Jun. 30, 2014
Uncommitted Letter of Credit [Member]
Note 11 - Revolving Credit Facility and Letter of Credit Facilities (Details) [Line Items]          
Line of Credit Facility, Maximum Borrowing Capacity   $ 450 $ 41 $ 440  
Aggregate Borrowing Commitment   750      
Line of Credit Facility, Current Borrowing Capacity       440  
Long-term Line of Credit       0 8.0
Letters of Credit Outstanding, Amount     22.2    
Cash Collateral Deposits $ 30.7