Note 22 - Income Taxes - Taxable Income and Provisions for Income Taxes (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income/(loss) before income taxes – U.S.		$ 1,051	$ (1,682)	$ 4,331
Deferred			(1,100)
Federal tax benefit/(provision)		(1,457)	2,968	(2,876)
State and local tax provision		(14)	(45)	(457)
Total tax benefit/(provision)– U.S.		978	(3,317)	1,600
Net income		1,002,877	413,561	498,463
Taxable REIT Subsidiaries [Member]
Current		(482)	3,362	(1,221)
Deferred		539	(349)	(1,198)
Federal tax benefit/(provision)		57	3,013	(2,419)
Current		(48)	(26)	(43)
Deferred		34	(19)	(414)
Total tax benefit/(provision)– U.S.		43	2,968	(2,876)
Net income		1,094	1,286	1,455
(Loss)/income before taxes – Non-U.S.		(64)	(599)	2,384
Current	[1]	(479)	69	(1,634)
Deferred		(0)	(418)	358
Non-U.S. tax benefit		$ 479	$ 349	$ 1,276

[1] The year ended December 31, 2018 includes a charge of $1.6 million related to the recording of a deferred tax valuation allowance.