Note 7 - Investment and Advances in Real Estate Joint Ventures - Investment and Advances to Real Estate Joint Ventures - Balance Sheets (Details) - USD ($) $ in Thousands		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Total real estate, net		$ 15,035,900	$ 9,346,041
Other assets		195,715	97,225
Assets, Total	[1]	18,459,199	11,614,498
Notes payable, net		7,027,050	5,044,208
Secured Debt, Total		448,652	311,272
Other Liabilities, Total		510,382	324,538
Members’ capital		9,899,389	5,608,044
Total Liabilities and Members’ Capital		18,459,199	11,614,498
Stockholders' Equity Attributable to Noncontrolling Interest, Ending Balance		210,793	62,210
Members’ capital		10,110,182	5,670,254	$ 4,928,907	$ 5,411,053
KIR [Member] | Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]
Total real estate, net		769,400	787,100
Other assets		68,200	75,300
Assets, Total		837,600	862,400
Notes payable, net		258,800	91,500
Secured Debt, Total		233,700	445,400
Other Liabilities, Total		16,200	17,400
Members’ capital		328,900	308,100
Total Liabilities and Members’ Capital		837,600	862,400
Excluding KIR [Member] | Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]
Total real estate, net		3,619,400	2,549,200
Other assets		193,800	179,000
Assets, Total		3,813,200	2,728,200
Notes payable, net		199,000	199,800
Secured Debt, Total		947,200	804,300
Other Liabilities, Total		73,800	53,600
Total Liabilities and Members’ Capital		3,813,200	2,728,200
Stockholders' Equity Attributable to Noncontrolling Interest, Ending Balance		32,600	18,300
Members’ capital		$ 2,560,600	$ 1,652,200

[1] Includes restricted assets of consolidated variable interest entities (“VIEs”) at December 31, 2021 and December 31, 2020 of $227,858 and $102,482, respectively. See Footnote 11 of the Notes to Consolidated Financial Statements.