Note 3 - Real Estate - Components of Rental Property (Details) - USD ($) $ in Thousands		Dec. 31, 2021	Dec. 31, 2020
Land		$ 3,978,775	$ 2,781,888
Buildings and improvements		14,067,824	9,281,267
Real estate		18,046,599	12,063,155
Accumulated depreciation and amortization (1)	[1]	(3,010,699)	(2,717,114)
Total real estate, net		15,035,900	9,346,041
Land [Member]
Land		3,962,447	2,758,936
Undeveloped Land [Member]
Land		16,328	22,952
Building [Member]
Buildings and improvements		10,042,225	5,911,602
Building Improvements [Member]
Buildings and improvements		1,999,319	1,918,641
Tenant Improvements [Member]
Buildings and improvements		987,216	820,027
Fixtures and Leasehold Improvements [Member]
Buildings and improvements		31,421	32,123
Above Market Leases [Member]
Buildings and improvements		166,840	125,858
In-place Leases [Member]
Buildings and improvements		$ 840,803	$ 473,016

[1] At December 31, 2021 and 2020, the Company had accumulated amortization relating to in-place leases and above-market leases aggregating $569,648 and $499,022, respectively.