Note 16 - Supplemental Schedule of Non-cash Investing / Financing Activities - Non-cash Investing and Financing Activities (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Acquisition of real estate interests through proceeds held in escrow	$ 30,970	$ 0
Disposition of real estate interests through the issuance of mortgage receivables	0	14,700
Disposition of real estate interests by foreclosure of debt	0	7,444
Forgiveness of debt due to foreclosure	0	12,415
Surrender of restricted common stock	3,689	3,492
Dividends payable	130,460	130,262	$ 130,262
Capital expenditures accrual	61,473	75,760
Decrease in real estate and other assets	0	300,299
Increase in investments in and advances to real estate joint ventures	0	(62,429)
Decrease in mortgages and construction loan payable, other liabilities and noncontrolling interests	$ 0	$ 248,274