Note 18 - Preferred Stock, Common Stock and Convertible Unit Transactions (Tables)

12 Months Ended

Dec. 31, 2023

Notes Tables

Class of Treasury Stock [Table Text Block]

Class of Preferred Stock	Depositary Shares Repurchased		Purchase Price (in thousands)
Class L		43,777	$	973.4
Class M		23,791	$	515.9

Schedule of Stockholders Equity [Table Text Block]

As of December 31, 2023
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		8,902	$	222,543		5.125	%	$	1.28125	$	1.00	8/16/2022
Class M		10,580		10,465		261,636		5.250	%	$	1.31250	$	1.00	12/20/2022
				19,367	$	484,179

As of December 31, 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

Dividends Declared [Table Text Block]

			Year Ended December 31,
	2023		2022		2021
Common Stock (1)	$	1.02000	$	0.84000	$	0.68000
Class L Depositary Shares	$	1.28125	$	1.28125	$	1.28125
Class M Depositary Shares	$	1.31250	$	1.31250	$	1.31250