Note 17 - Preferred Stock, Common Stock and Convertible Unit Transactions (Tables)

12 Months Ended

Dec. 31, 2012

Outstanding Preferred Stock [Member]

Dec. 31, 2011

Preferred Stock Issued [Member]

Dec. 31, 2011

Preferred Stock Redeemed [Member]

Schedule of Stockholders Equity [Table Text Block]

As of December 31, 2012
Series of Preferred Stock	Shares Authorized		Shares  Issued and  Outstanding		Liquidation Preference		Dividend Rate			Annual Dividend  per Depositary Share		Par Value
Series H		70,000		70,000	$	175,000		6.90	%	$	1.72500	$	1.00
Series I		18,400		16,000		400,000		6.00	%	$	1.50000	$	1.00
Series J		9,000		9,000		225,000		5.50	%	$	1.37500	$	1.00
Series K		8,050		7,000		175,000		5.625	%	$	1.40625	$	1.00
		105,450		102,000	$	975,000

As of December 31, 2011
Series of Preferred Stock	Shares Authorized		Shares  Issued and Outstanding		Liquidation  Preference		Dividend  Rate			Annual  Dividend per Depositary Share		Par Value
Series F		700,000		700,000	$	175,000		6.65	%	$	1.66250	$	1.00
Series G		184,000		184,000		460,000		7.75	%	$	1.93750	$	1.00
Series H		70,000		70,000		175,000		6.90	%	$	1.72500	$	1.00
		954,000		954,000	$	810,000

Series of Preferred Stock	Date Issued	Depositary  Shares  Issued	Fractional Interest per  Share	Net  Proceeds, After  Expenses (in millions)		Offering/ Redemption Price		Optional Redemption  Date
Series H(1)	8/30/2010	7,000,000	1/100	$	169.2	$	25.00	8/30/2015
Series I (2)	3/20/2012	16,000,000	1/1000	$	387.2	$	25.00	3/20/2017
Series J (3)	7/25/2012	9,000,000	1/1000	$	217.8	$	25.00	7/25/2017
Series K (4)	12/7/2012	7,000,000	1/1000	$	169.1	$	25.00	12/7/2017

Series of Preferred Stock	Date Issued	Depositary  Shares  Issued	Redemption Amount (in millions)		Offering/ Redemption Price		Optional Redemption Date	Actual Redemption Date
Series F (1)	6/5/2003	7,000,000	$	175.0	$	25.00	6/5/2008	8/15/2012
Series G (2)	10/10/2007	18,400,000	$	460.0	$	25.00	10/10/2012	10/10/2012