Note 19 - Preferred Stock, Common Stock and Convertible Unit Transactions - Preferred Stock Repurchased (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Shares repurchased (in shares)	567,450	1,084,953	294,346
Purchase price	$ 3,441	$ (0)	$ (0)
Class L Cumulative Redeemable Preferred Stock Depositary Shares[Member]
Shares repurchased (in shares)	54,508
Purchase price	$ 1,300
Class M Cumulative Redeemable Preferred Stock Depositary Shares [Member]
Shares repurchased (in shares)	90,760
Purchase price	$ 2,100