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Note 7 - Senior and Subordinated Debt (Detail) (USD $)	3 Months Ended	6 Months Ended
Note 7 - Senior and Subordinated Debt (Detail) (USD $)	Mar. 31, 2012	Jun. 30, 2012
Proceeds from (Repayments of) Long-term Debt and Capital Securities		$ (20,004,000)
Debt Instrument, Face Amount	84,700,000
Discount on Retirement of Junior Subordinated Debt	2.25%
Retired Debt [Member]
Proceeds from (Repayments of) Long-term Debt and Capital Securities	21,100,000
Gains (Losses) on Extinguishment of Debt	256,000
Series B Preferred Stock [Member]
Stock Repurchased and Retired During Period, Value		$ 193,000,000

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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- Definition

Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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