Consolidated Statements of Cash Flows (Parentheticals) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Liability for real estate additions	$ 4,955	$ 3,191	$ 631
Vornado
Liability for real estate additions	$ 489	$ 18	$ 125