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Note 14 - Noncontrolling Interests (Details Textual) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2007 USD ($) shares	Dec. 31, 2006 USD ($) $ / shares shares	Sep. 20, 2017
Redeemable Non-controlling Interest, Issuance Amount, Fair Value Remeasurement	$ 1,000
Noncontrolling Interest, Increase from Subsidiary Equity Issuance	48,877	$ 16,667	$ 66,163
Redeemable Noncontrolling Interest, Equity, Carrying Amount	$ 16,143	86,953	$ 86,709
PUERTO RICO
Number of Real Estate Properties	7					7
Noncontrolling Interest, Increase from Subsidiary Equity Issuance	$ 233,000
Redeemable Noncontrolling Interest, Equity, Carrying Amount	5,200	86,200
PUERTO RICO | Fair Market Value Adjustments [Member]
Noncontrolling Interest, Increase from Subsidiary Equity Issuance	$ 15,100
Preferred A Units [Member]
Non-controlling Interest, Units Redeemed | shares	79,642,697
Payments for Repurchase of Redeemable Noncontrolling Interest	$ 79,900
Payments for Repurchase of Redeemable Noncontrolling Interest, Accrued Preferred Return	$ 400
Non-controlling Interest, Par Value | $ / shares	$ 1
Non-controlling Interest, Annual Return	5.00%
Non-convertible Units [Member] | PUERTO RICO
Noncontrolling Interest, Increase from Subsidiary Equity Issuance	$ 158,600
Convertible Units [Member]
Noncontrolling Interest, Increase from Subsidiary Equity Issuance					$ 5,300
Non-controlling Interest, Units | shares					138,015
Convertible Units [Member] | Fair Market Value Adjustments [Member]
Noncontrolling Interest, Increase from Subsidiary Equity Issuance					$ 300
Convertible Units [Member] | PUERTO RICO
Noncontrolling Interest, Increase from Subsidiary Equity Issuance	45,800
Premiums [Member] | PUERTO RICO
Noncontrolling Interest, Increase from Subsidiary Equity Issuance	$ 13,500
Class B Units [Member]
Non-controlling Interest, Units Redeemed | shares	25,000			30,000
Non-controlling Interest, Par Value | $ / shares					$ 37.24
Redeemable Noncontrolling Interest, Equity, Carrying Amount	$ 25,400	$ 26,500
Non-controlling Interest, Units Issued | shares					647,758
Redeemable Units to Company Common Stock, Ratio					1
Non-controlling Interest, Cumulative Par Value	$ 900			$ 1,100
KIM Lincoln, LLC [Member]
Ownership Interest in Joint Venture, Percentage	90.00%
Lincoln Square Property, LP [Member]
Ownership Interest in Joint Venture, Percentage	10.00%

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- Definition

The annual return from non-controlling interest represented by a percentage.

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=84161450&loc=SL4573702-111684

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 45
-Paragraph 23
-URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4569655-111683

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Section S99
-Paragraph 3A
-Subparagraph (12)(c)
-URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Section S99
-Paragraph 3A
-Subparagraph 15
-URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Subparagraph 14
-URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764

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