Note 21 - Subsequent Events (Details) (USD $)	12 Months Ended			3 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Mar. 31, 2012 January 2012 Assured Guaranty Transaction [Member]
Subsequent Event [Line Items]
Impact of Subsequent Event on Assumed Premiums Written				$ (119,800,000)
Impact of Subsequent Event on Net Premiums Earned				(22,200,000)
Impact of Subsequent Event on Change in Fair Value of Derivatives				100,000
Impact of Subsequent Event on Policy Acquisition Costs				(15,700,000)
Gain on sale of affiliate	0	34,815,000	0	9,000,000
Impact of Subsequent Event on Pre-Tax Income				(28,800,000)
Impact of Subsequent Event, Decrease to Cash				92,300,000
Impact of Subsequent Event, Decrease to Deferred Policy Acquisition Costs				26,200,000
Impact of Subsequent Event, Decrease to Accounts and Notes Receivable				1,100,000
Impact of Subsequent Event, Decrease To Derivative Assets				600,000
Impact of Subsequent Event, Decrease to Unearned Premiums				71,600,000
Impact of Subsequent Event, Decrease to Derivative Liabilities				900,000
Impact of Subsequent Event, Increase to Other Assets				$ 19,000,000