Note 5 - Non-Operating Income (Detail) - Non-operating income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Non-operating Income	$ 25,245	$ 20,533	$ 23,340
Equity in Earnings of Unconsolidated Investments [Member]
Non-operating Income	13,616	9,674	8,993
Dividends and Other Net Realized Gains and Losses on Sales of Securities [Member]
Non-operating Income	7,006	5,875	5,404
Interest Income [Member]
Non-operating Income	4,623	4,984	5,380
Recovery of Assets in Acquisition [Member]
Non-operating Income			$ 3,563