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

12 Months Ended

Dec. 31, 2021

Notes Tables

Schedule of Stockholders Equity [Table Text Block]

As of December 31, 2021 and 2020
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]

	Year Ended December 31,
	2021		2020		2019
Common Stock	$	0.68000	$	0.54000	$	1.12000
Class I Depositary Shares	$	-	$	-	$	0.99583
Class J Depositary Shares	$	-	$	-	$	1.37500
Class K Depositary Shares	$	-	$	-	$	0.93359
Class L Depositary Shares	$	1.28125	$	1.28125	$	1.28125
Class M Depositary Shares	$	1.31250	$	1.31250	$	1.31250