Note 15 - Fair Value Disclosure of Financial Instruments (Details) - Assets and Liabilities Measured at Fair Value on a Recurring and Nonrecurring Basis (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Assets:
Marketable equity securities	$ 87,659	$ 59,723
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Marketable equity securities	87,659	59,723
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Liabilities:
Interest rate swaps	1,404
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Liabilities:
Real Estate	80,270	217,529
Joint venture investments		59,693
Other real estate investments		2,050
Cost method investment		4,670
Fair Value, Measurements, Recurring [Member]
Assets:
Marketable equity securities	87,659	59,723
Liabilities:
Interest rate swaps	1,404
Fair Value, Measurements, Nonrecurring [Member]
Liabilities:
Real Estate	80,270	217,529
Joint venture investments		59,693
Other real estate investments		2,050
Cost method investment		$ 4,670