Note 12 - Preferred Stock and Common Stock (Tables)

9 Months Ended

Sep. 30, 2017

Notes Tables

Schedule of Stockholders Equity [Table Text Block]

As of September 30, 2017
Series of Preferred Stock	Shares Authorized		Shares Issued and Outstanding		Liquidation Preference (in thousands)		Dividend Rate			Annual Dividend per Depositary Share		Par Value		Optional Redemption Date
Series I		18,400		7,000	$	175,000		6.00	%	$	1.50000	$	1.00	3/20/2017
Series J		9,000		9,000		225,000		5.50	%	$	1.37500	$	1.00	7/25/2017
Series K		8,050		7,000		175,000		5.625	%	$	1.40625	$	1.00	12/7/2017
Series L		10,350		9,000		225,000		5.125	%	$	1.28125	$	1.00	8/16/2022
		45,800		32,000	$	800,000

As of December 31, 201 6
Series of Preferred Stock	Shares Authorized		Shares Issued and Outstanding		Liquidation Preference (in thousands)		Dividend Rate			Annual Dividend per Depositary Share		Par Value		Optional Redemption Date
Series I		18,400		16,000	$	400,000		6.00	%	$	1.50000	$	1.00	3/20/2017
Series J		9,000		9,000		225,000		5.50	%	$	1.37500	$	1.00	7/25/2017
Series K		8,050		7,000		175,000		5.625	%	$	1.40625	$	1.00	12/7/2017
		35,450		32,000	$	800,000

Preferred Stock Redeemed [Member]

Notes Tables

Schedule of Stockholders Equity [Table Text Block]

Series of Preferred Stock	Date Issued	Depositary Shares Redeemed		Redemption Amount (in millions)		Redemption Price		Redemption Date
Series I (1)	3/20/2012		9,000,000	$	225.0	$	25.00	9/6/2017

Preferred Stock Issued [Member]

Notes Tables

Schedule of Stockholders Equity [Table Text Block]

Series of Preferred Stock	Date Issued	Depositary Shares Issued		Fractional Interest per Share	Net Proceeds, A fter Expenses (in millions)		Offering Price		Optional Redemption Date
Series L	8/16/2017		9,000,000	1/1000	$	217.6		25.00	8/16/2022