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Note 10 - Notes Payable (Detail) (USD $)	1 Months Ended	9 Months Ended
Note 10 - Notes Payable (Detail) (USD $)	Apr. 30, 2012	Sep. 30, 2012
Proceeds from Issuance of Unsecured Debt (in Dollars)	$ 400,000,000	$ 400,000,000
Debt Instrument, Number of Additional Options	3
Debt Instrument, Additional Options, Term	1 year
Repayments of Medium-term Notes (in Dollars)		$ 17,000,000
Unsecured Debt [Member]
Debt Instrument, Basis Spread on Variable Rate (in Basis Points)	1.05%
Medium-term Notes [Member]
Debt Instrument, Interest Rate, Stated Percentage		5.98%

The cash inflow from the issuance of long-term debt that is not secured by collateral. Excludes proceeds from tax exempt unsecured debt.

The cash outflow to pay off borrowing used to receive debt funding on a regular basis with maturities ranging from 5-10 years.