Note 11 - Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2015

Fair Value Disclosures [Abstract]

Fair Value, by Balance Sheet Grouping [Table Text Block]

	September 30, 2015				December 31, 2014
	Carrying Amounts		Estimated Fair Value		Carrying Amounts		Estimated Fair Value
Marketable securities (1)	$	12,189	$	12,189	$	90,235	$	90,035
Notes payable (2)	$	3,852,640	$	3,940,295	$	3,171,742	$	3,313,936
Mortgages payable (3)	$	1,645,946	$	1,680,714	$	1,424,228	$	1,481,138

Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]

	Balance at September 30, 2015		Level 1		Level 2		Level 3
Assets:
Marketable equity securities	$	10,533	$	10,533	$	-	$	-
Liabilities:
Interest rate swaps (1)	$	1,879	$	-	$	1,879	$	-

	Balance at December 31, 2014		Level 1		Level 2		Level 3
Assets:
Marketable equity securities	$	87,659	$	87,659	$	-	$	-
Liabilities:
Interest rate swaps (1)	$	1,404	$	-	$	1,404	$	-

	Balance at September 30, 2015		Level 1		Level 2		Level 3
Real estate	$	23,838	$	-	$	-	$	23,838

	Balance at December 31, 2014		Level 1		Level 2		Level 3
Real estate	$	80,270	$	-	$	-	$	80,270