Note 15 - Fair Value Disclosure of Financial Instruments (Details) - Financial Instruments: Estimate of Fair Value Differs from Carrying Amounts - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014
Financial Instruments: Estimate of Fair Value Differs from Carrying Amounts [Abstract]
Marketable Securities (1)	[1]	$ 7,565	$ 90,235
Marketable Securities (1)	[1]	7,564	90,035
Notes Payable (2)	[2]	3,761,328	3,171,742
Notes Payable (2)	[2]	3,820,205	3,313,936
Mortgages Payable (3)	[3]	1,614,982	1,424,228
Mortgages Payable (3)	[3]	$ 1,629,760	$ 1,481,138

[1] As of December 31, 2015 and 2014, the Company determined that $5.9 million and $87.7 million, respectively, of the Marketable securities estimated fair value were classified within Level 1 of the fair value hierarchy and the remaining $1.7 million and $2.3 million, respectively, were classified within Level 3 of the fair value hierarchy.

[2] The Company determined that its valuation of these Notes Payable was classified within Level 2 of the fair value hierarchy.

[3] The Company determined that its valuation of these Mortgages Payable was classified within Level 3 of the fair value hierarchy.