Note 17 - Stockholders' Equity - Dividends Declared (Details) - $ / shares	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Common Shares (in dollars per share)	$ 0.24	$ 0.23
Series L Preferred Stock [Member]
Preferred Shares (in dollars per share)	0.32031	0.32031
Series M Preferred Stock [Member]
Preferred Shares (in dollars per share)	0.32813	0.32813
Class N Preferred Stock [Member]
Preferred Shares (in dollars per share)	$ 0.90625	$ 0