Note 12 - Fair Value Measurements (Details Textual) - Estimate of Fair Value Measurement [Member] - USD ($) $ in Thousands		Mar. 31, 2022	Dec. 31, 2021
Notes Payable, Fair Value Disclosure	[1]	$ 6,875,691	$ 7,330,723
Fair Value, Inputs, Level 2 [Member]
Notes Payable, Fair Value Disclosure		$ 6,900,000	$ 7,300,000

[1] The Company determined that the valuation of its senior unsecured notes were classified within Level 2 of the fair value hierarchy and its Credit Facility was classified within Level 3 of the fair value hierarchy. The estimated fair value amounts classified as Level 2, as of March 31, 2022 and December 31, 2021, were $6.9 billion and $7.3 billion, respectively.