Note 4 - Non-operating Income (Details) - Non-operating Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Note 4 - Non-operating Income (Details) - Non-operating Income [Line Items]
Non-operating Income	$ 17,182	$ 30,095	$ 25,245
Equity in Earnings of Unconsolidated Investments [Member]
Note 4 - Non-operating Income (Details) - Non-operating Income [Line Items]
Non-operating Income	6,675	14,188	13,616
Dividends and Other Net Realized Gains and Losses on Sales of Securities [Member]
Note 4 - Non-operating Income (Details) - Non-operating Income [Line Items]
Non-operating Income	5,957	5,216	7,006
Interest Income [Member]
Note 4 - Non-operating Income (Details) - Non-operating Income [Line Items]
Non-operating Income	4,550	5,237	4,623
Gain on Recovery of Notes Receivable [Member]
Note 4 - Non-operating Income (Details) - Non-operating Income [Line Items]
Non-operating Income		$ 5,454