Note 14 - Supplemental Schedule of Non-Cash Investing/Financing Activities (Details) - Non-Cash Investing and Financing Activities (USD $) In Thousands, unless otherwise specified	6 Months Ended
Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Note 14 - Supplemental Schedule of Non-Cash Investing/Financing Activities (Details) - Non-Cash Investing and Financing Activities [Line Items]
Acquisition of real estate interests by assumption of mortgage debt	$ 210,232	$ 36,716
Acquisition of real estate interests by issuance of redeemable units/partnership interest	6,122	3,985
Acquisition of real estate interests through proceeds held in escrow	14,884
Proceeds held in escrow through sale of real estate interests	14,352
Issuance of restricted common stock	11,451	9,213
Disposition of real estate through the issuance of an unsecured obligation		3,513
Declaration of dividends paid in succeeding period	104,786	98,326	104,496
Increase in real estate and other assets	303,374	228,200
Increase in mortgages payable	180,279	206,489
Non-cash [Member]
Note 14 - Supplemental Schedule of Non-Cash Investing/Financing Activities (Details) - Non-Cash Investing and Financing Activities [Line Items]
Surrender of restricted common stock	$ (3,729)	$ (3,176)

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The amount of adjustment to stockholders' equity associated with an employee's income tax withholding obligation as part of a net-share settlement of a share-based award.

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Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding.

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Amount of escrow deposit disbursements related to property acquisition in noncash investing or financing transactions.

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-Name Accounting Standards Codification

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Escrow deposits related to property sales in noncash investing and financing activities.

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The fair value of liabilities assumed in noncash investing or financing activities.

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Mortgage loan related to property sales in noncash investing and financing activities.

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The amount of assets that an Entity acquires in a noncash (or part noncash) acquisition that are not presented as a separate disclosure or not otherwise listed in the existing taxonomy. Noncash is defined as information about all investing and financing activities of an enterprise during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period.

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The value of an asset or business acquired in a noncash (or part noncash) acquisition. Noncash is defined as information about all investing and financing activities of an enterprise during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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The total amount of [all] liabilities that an Entity assumes in acquiring a business or in consideration for an asset received in a noncash (or part noncash) acquisition. Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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The fair value of stock issued in noncash financing activities.

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