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Note 9 - Notes Payable (Details) (USD $)
3 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended 6 Months Ended
Mar. 31, 2014
Jun. 30, 2014
Jun. 30, 2013
Apr. 30, 2014
Subsequent Event [Member]
Unsecured Debt [Member]
Jun. 30, 2014
5.95% Senior Notes [Member]
Unsecured Debt [Member]
Jun. 30, 2014
4.82% Senior Notes [Member]
Unsecured Debt [Member]
Mar. 31, 2014
Previous Credit Facility [Member]
Mar. 31, 2014
Including Accordion Feature [Member]
Jun. 30, 2014
Letter of Credit [Member]
Jun. 30, 2014
London Interbank Offered Rate (LIBOR) [Member]
Note 9 - Notes Payable (Details) [Line Items]                    
Line of Credit Facility, Maximum Borrowing Capacity   $ 1,750,000,000         $ 1,750,000,000 $ 2,250,000,000    
Number of Options to Extend Maturity of Credit Facility   2                
Line of Credit Facility, Length of Extension for Each Option 6 months                  
Debt Instrument, Basis Spread on Variable Rate                   0.925%
Line of Credit Facility, Sub Limit   500,000,000                
Long-term Line of Credit   337,600,000             1,100,000  
Debt Instrument, Face Amount       500,000,000            
Debt Instrument, Term       7 years            
Debt Instrument, Interest Rate, Stated Percentage       3.20% 5.95% 4.82%        
Proceeds from Issuance of Senior Long-term Debt       495,400,000            
Repayments of Unsecured Debt   $ 294,570,000 $ 253,225,000   $ 100,000,000 $ 194,600,000