Note 11 - Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2015

Fair Value Disclosures [Abstract]

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

	March 31, 2015				December 31, 2014
	Carrying Amounts		Estimated Fair Value		Carrying Amounts		Estimated Fair Value
Marketable securities (1)	$	105,253	$	105,108	$	90,235	$	90,035
Notes payable (2)	$	3,679,237	$	3,836,369	$	3,171,742	$	3,313,936
Mortgages payable (3)	$	2,042,014	$	2,103,356	$	1,424,228	$	1,481,138

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

	Balance at March 31, 2015		Level 1		Level 2		Level 3
Assets:
Marketable equity securities	$	102,732	$	102,732	$	-	$	-
Liabilities:
Interest rate swaps	$	1,756	$	-	$	1,756	$	-

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

	Balance at March 31, 2015		Level 1		Level 2		Level 3
Real estate	$	11,000	$	-	$	-	$	11,000

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