Consolidated Statement of Equity - USD ($)	Total	Limited Partners' Interest In Operating Partnership [Member]	Preferred Stock [Member]	Common Stock [Member]	Treasury Stock, At Cost [Member]	Additional Paid-In Capital [Member]	Cumulative Distributions In Excess Of Net Income [Member]	Accumulated Other Comprehensive Income [Member]	Cedar Realty Trust, Inc. [Member]	Minority Interests In Consolidated Joint Ventures [Member]	Noncontrolling Interests [Member]
Balance at Dec. 31, 2019	$ 514,075,000	$ 3,079,000	$ 159,541,000	$ 809,000	$ (16,311,000)	$ 877,256,000	$ (503,725,000)	$ (7,009,000)	$ 510,561,000	$ 435,000	$ 3,514,000
Balance, shares at Dec. 31, 2019			6,450,000	13,488,000
Net income (loss)	(2,098,000)	(28,000)					(2,246,000)		(2,246,000)	176,000	148,000
Unrealized gain (loss) on change in fair value of cash flow hedges	(15,014,000)	(90,000)						(14,924,000)	(14,924,000)		(90,000)
Share-based compensation, net	866,000			$ 3,000	1,006,000	(143,000)			866,000
Share-based compensation, net, shares				46,000
Common stock sales, net of issuance expenses	5,000					5,000			5,000
Preferred stock dividends	(2,688,000)						(2,688,000)		(2,688,000)
Distributions to common shareholders/noncontrolling interests	(4,495,000)	(27,000)					(4,468,000)		(4,468,000)		(27,000)
Reallocation adjustment of limited partners' interest		(5,000)				5,000			5,000		(5,000)
Balance at Mar. 31, 2020	490,651,000	2,929,000	$ 159,541,000	$ 812,000	(15,305,000)	877,123,000	(513,127,000)	(21,933,000)	487,111,000	611,000	3,540,000
Balance, shares at Mar. 31, 2020			6,450,000	13,534,000
Balance at Dec. 31, 2020	487,458,000	2,907,000	$ 159,541,000	$ 812,000	(15,133,000)	879,790,000	(522,696,000)	(18,816,000)	483,498,000	1,053,000	3,960,000
Balance, shares at Dec. 31, 2020			6,450,000	13,530,000
Net income (loss)	1,253,000	(9,000)					1,112,000		1,112,000	150,000	141,000
Unrealized gain (loss) on change in fair value of cash flow hedges	4,197,000	26,000						4,171,000	4,171,000		26,000
Share-based compensation, net	781,000			$ 6,000	1,172,000	(397,000)			781,000
Share-based compensation, net, shares				99,000
Common stock sales, net of issuance expenses	1,000					1,000			1,000
Preferred stock dividends	(2,688,000)						(2,688,000)		(2,688,000)
Distributions to common shareholders/noncontrolling interests	(904,000)	(5,000)					(899,000)		(899,000)		(5,000)
Reallocation adjustment of limited partners' interest		(19,000)				19,000			19,000		(19,000)
Balance at Mar. 31, 2021	$ 490,098,000	$ 2,900,000	$ 159,541,000	$ 818,000	$ (13,961,000)	$ 879,413,000	$ (525,171,000)	$ (14,645,000)	$ 485,995,000	$ 1,203,000	$ 4,103,000
Balance, shares at Mar. 31, 2021			6,450,000	13,629,000