Note 15 - Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 2022

Notes Tables

Class of Treasury Stock [Table Text Block]

Class of Preferred Stock	Depositary Shares Repurchased		Purchase Price (in millions)
Class L		54,508	$	1.3
Class M		90,760	$	2.1

Schedule of Stockholders Equity [Table Text Block]

As of June 30, 2022
Class 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
Class L		10,350		8,946	$	223,637		5.125	%	$	1.28125	$	1.00	8/16/2022
Class M		10,580		10,489		262,231		5.250	%	$	1.31250	$	1.00	12/20/2022
				19,435	$	485,868

As of December 31, 2021
Class 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
Class L		10,350		9,000	$	225,000		5.125	%	$	1.28125	$	1.00	8/16/2022
Class M		10,580		10,580		264,500		5.250	%	$	1.31250	$	1.00	12/20/2022
				19,580	$	489,500

Dividends Declared [Table Text Block]

	Three Months Ended June 30,				Six Months Ended June 30,
	2022		2021		2022		2021
Common Shares	$	0.20000	$	0.17000	$	0.39000	$	0.34000
Class L Depositary Shares	$	0.32031	$	0.32031	$	0.64062	$	0.64062
Class M Depositary Shares	$	0.32813	$	0.32813	$	0.65626	$	0.65626