Note 8 - Investments in Affiliates (Details) (USD $)	12 Months Ended			3 Months Ended	4 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Jun. 30, 2010 Sherman [Member]	May 03, 2010 Sherman [Member]	Dec. 31, 2010 Sherman [Member]
Equity Method Investment, Realized Gain (Loss) on Disposal [Abstract]
Equity Method Investment, Ownership Percentage					28.70%
Proceeds from Sale of Equity Method Investments					$ 172,000,000
Gain on sale of affiliate	7,708,000	0	34,815,000	34,800,000
Related Party Transaction, Expenses from Transactions with Related Party				1,300,000
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity				29,700,000
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Investments in and Advances to Affiliates, at Fair Value					121,424,000	121,424,000
Income (Loss) from Equity Method Investments						14,590,000
Investments in and Advances to Affiliates, at Fair Value, Dividends Received						(29,498,000)
Investments in and Advances to Affiliates, at Fair Value, Other Comprehensive Loss						(381,000)
Investments in and Advances to Affiliates, at Fair Value, Sale of Ownership Interest						(106,135,000)
Investments in and Advances to Affiliates, at Fair Value						$ 0