Note 14 - Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2020

Notes Tables

Schedule of Stockholders Equity [Table Text Block]

As of March 31, 2020 and December 31, 2019
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 March 31,
	2020		2019
Common Shares	$	0.28000	$	0.28000
Class I Depositary Shares (1)	$	-	$	0.37500
Class J Depositary Shares (1)	$	-	$	0.34375
Class K Depositary Shares (1)	$	-	$	0.35156
Class L Depositary Shares	$	0.32031	$	0.32031
Class M Depositary Shares	$	0.32813	$	0.32813