Note 14 - Noncontrolling Interests (Details) - Redeemed Units $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($) shares
Preferred A Units [Member]
Note 14 - Noncontrolling Interests (Details) - Redeemed Units [Line Items]
Units Redeemed | shares	2,200,000
Par Value Redeemed | $	$ 2.2
Class A Preferred Units [Member]
Note 14 - Noncontrolling Interests (Details) - Redeemed Units [Line Items]
Units Redeemed | shares	2,000
Par Value Redeemed | $	$ 20.0
Class B-1 Preferred Units [Member]
Note 14 - Noncontrolling Interests (Details) - Redeemed Units [Line Items]
Units Redeemed | shares	2,438
Par Value Redeemed | $	$ 24.4
Class B-2 Preferred Units [Member]
Note 14 - Noncontrolling Interests (Details) - Redeemed Units [Line Items]
Units Redeemed | shares	5,631
Par Value Redeemed | $	$ 56.3
Class C DownReit Units [Member]
Note 14 - Noncontrolling Interests (Details) - Redeemed Units [Line Items]
Units Redeemed | shares	587,204
Par Value Redeemed | $	$ 17.9