Note 15 - Stockholders' Equity - Preferred Stock Repurchased (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Purchase price	$ 268	$ (0)
Class L Cumulative Redeemable Preferred Stock Depositary Shares[Member]
Shares repurchased (in shares)	5,540
Purchase price	$ 111,000
Class M Cumulative Redeemable Preferred Stock Depositary Shares [Member]
Shares repurchased (in shares)	7,741
Purchase price	$ 157,000