Note 12 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring and Nonrecurring Basis (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable equity securities	$ 74,547	$ 59,723
Real estate	228,798	217,529
Joint venture investments		59,693
Other real estate investments		2,050
Cost method investment		4,670
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable equity securities	74,547	59,723
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Real estate	228,798	217,529
Joint venture investments		59,693
Other real estate investments		2,050
Cost method investment		$ 4,670