Note 11 - Fair Value Measurements (Details) - Financial Instruments: Estimate of Fair Value Differs from Carrying Amounts - USD ($) $ in Thousands		Sep. 30, 2015	Dec. 31, 2014
Financial Instruments: Estimate of Fair Value Differs from Carrying Amounts [Abstract]
Marketable securities (1)	[1]	$ 12,189	$ 90,235
Marketable securities (1)	[1]	12,189	90,035
Notes payable (2)	[2]	3,852,640	3,171,742
Notes payable (2)	[2]	3,940,295	3,313,936
Mortgages payable (3)	[3]	1,645,946	1,424,228
Mortgages payable (3)	[3]	$ 1,680,714	$ 1,481,138

[1] As of September 30, 2015 and December 31, 2014, the Company determined that $10.5 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 Notes payable was classified within Level 2 of the fair value hierarchy.

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