Note 4 - Non-Operating Income (Detail) - Non-operating income (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Non-operating Income	$ 6,771	$ 5,140	$ 18,546	$ 14,856
Equity in Earnings of Unconsolidated Investments [Member]
Non-operating Income	4,063	2,464	10,079	7,203
Dividends and Other Net Realized Gains and Losses on Sales of Securities [Member]
Non-operating Income	1,607	1,410	5,074	3,928
Interest Income [Member]
Non-operating Income	$ 1,101	$ 1,266	$ 3,393	$ 3,725