Note 14 - Stockholders' Equity - Dividends Declared (Details) - $ / shares			3 Months Ended				9 Months Ended
		Sep. 24, 2020	Sep. 30, 2020		Sep. 30, 2019		Sep. 30, 2020		Sep. 30, 2019
Common Stock (in dollars per share)		$ 0.10	$ 0.10000	[1]	$ 0.28000	[1]	$ 0.38000	[1]	$ 0.84000	[1]
Series I Preferred Stock [Member]
Preferred Shares (in dollars per share)	[2]		0		0.24583		0		0.99583
Series J Preferred Stock [Member]
Preferred Shares (in dollars per share)	[2]		0		0.34375		0		1.03125
Series K Preferred Stock [Member]
Preferred Shares (in dollars per share)	[2]		0		0.23047		0		0.93359
Series L Preferred Stock [Member]
Preferred Shares (in dollars per share)			0.32031		0.32031		0.96093		0.96093
Series M Preferred Stock [Member]
Preferred Shares (in dollars per share)			$ 0.32813		$ 0.32813		$ 0.98439		$ 0.98439

[1] As a result of the COVID-19 pandemic and the future economic uncertainties, out of an abundance of caution, the Company’s Board of Directors had temporarily suspended the dividend on its common shares. In September 2020, the Company’s Board of Directors reinstated and declared a quarterly cash dividend of $0.10 per common share, which was paid on September 24, 2020, to shareholders of record on September 10, 2020.

[2] Shares were fully redeemed during 2019. During the three and nine months ended September 30, 2019, the Company recognized redemption charges of $11.4 million resulting from the difference between the redemption amount and the carrying amount of the respective preferred stock class on the Company’s Condensed Consolidated Balance Sheets are accounted for in accordance with the FASB’s guidance on Distinguishing Liabilities from Equity. These charges were subtracted from net income attributable to the Company to arrive at net income available to the Company’s common shareholders and used in the calculation of earnings per share.