Note 15 - Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2023

Notes Tables

Class of Treasury Stock [Table Text Block]

Class of Preferred Stock	Depositary Shares Repurchased		Purchase Price (in thousands)
Class L		5,540	$	111.0
Class M		7,741	$	157.0

Schedule of Stockholders Equity [Table Text Block]

As of March 31, 2023
Class of Preferred Stock	Shares Authorized		Shares Issued and Outstanding		Liquidation Preference		Dividend Rate			Annual Dividend per Depositary Share		Par Value		Optional Redemption Date
Class L		10,350		8,940	$	223,499		5.125	%	$	1.28125	$	1.00	8/16/2022
Class M		10,580		10,481		262,037		5.250	%	$	1.31250	$	1.00	12/20/2022
				19,421	$	485,536

As of December 31, 2022
Class of Preferred Stock	Shares Authorized		Shares Issued and Outstanding		Liquidation Preference		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

Dividends Declared [Table Text Block]

	Three Months Ended March 31,
	2023		2022
Common Shares	$	0.23000	$	0.19000
Class L Depositary Shares	$	0.32031	$	0.32031
Class M Depositary Shares	$	0.32813	$	0.32813