Note 18 - Preferred Stock, Common Stock and Convertible Unit Transactions - Dividends Declared (Details) - $ / shares		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Common Stock (1) (in dollars per share)	[1]	$ 1.02	$ 0.84	$ 0.68
Series L Preferred Stock [Member]
Preferred Shares (in dollars per share)		1.28125	1.28125	1.28125
Series M Preferred Stock [Member]
Preferred Shares (in dollars per share)		$ 1.3125	$ 1.3125	$ 1.3125

[1] During 2023, the Company’s Board of Directors declared a $0.09 per common share special cash dividend to maintain distribution requirements as a REIT.