SUMMARY OF MARKETABLE SECURITIES (Details) - USD ($) shares in Thousands, $ in Thousands	Dec. 31, 2021		Dec. 31, 2020
Marketable Securities [Line Items]
Cost	$ 128,055		$ 142,531
Market Value	$ 113,748		$ 103,172
Cedar Realty Trust, Inc Series B [Member]
Marketable Securities [Line Items]
Interest Rate	7.25%		7.25%
Number of Shares	10		10
Cost	$ 237		$ 219
Market Value	$ 264		$ 206
Cedar Realty Trust Inc Series C [Member]
Marketable Securities [Line Items]
Interest Rate	6.50%		6.50%
Number of Shares	20		20
Cost	$ 494		$ 494
Market Value	$ 505		$ 428
Centerspace Series C [Member]
Marketable Securities [Line Items]
Interest Rate	6.625%		6.625%
Number of Shares	20		20
Cost	$ 500		$ 500
Market Value	$ 522		$ 520
Pennsylvania Real Estate Investment Trust Series B [Member]
Marketable Securities [Line Items]
Interest Rate	7.375%		7.375%
Number of Shares	40		40
Cost	$ 1,000		$ 1,000
Market Value	$ 304		$ 404
Pennsylvania Real Estate Investment Trust Series D [Member]
Marketable Securities [Line Items]
Interest Rate	6.875%		6.875%
Number of Shares	20		20
Cost	$ 498		$ 498
Market Value	145		206
Preferred Stock [Member]
Marketable Securities [Line Items]
Cost	2,729		5,061
Market Value	$ 1,740		$ 2,601
CBL and Associates Properties, Inc [Member]
Marketable Securities [Line Items]
Number of Shares	12		1,600
Cost	$ 18,230		$ 16,692
Market Value	$ 361		$ 66
Five Star Senior Living [Member]
Marketable Securities [Line Items]
Number of Shares	12		12
Cost	$ 45		$ 45
Market Value	$ 34		$ 80
Franklin Street Properties Corporation [Member]
Marketable Securities [Line Items]
Number of Shares	220		220
Cost	$ 2,219		$ 2,219
Market Value	$ 1,309		$ 961
Industrial Logistics Properties Trust [Member]
Marketable Securities [Line Items]
Number of Shares	87		502
Cost	$ 1,729		$ 9,951
Market Value	$ 2,186		$ 11,698
Kimco Realty Corporation [Member]
Marketable Securities [Line Items]
Number of Shares	890		910
Cost	$ 16,677		$ 17,052
Market Value	$ 21,939		$ 13,659
Monmouth Real Estate Investment Corporation [Member]
Marketable Securities [Line Items]
Number of Shares	2,655	[1]	2,655	[2]
Cost	$ 25,031	[1]	$ 25,031	[2]
Market Value	$ 55,778	[1]	$ 45,982	[2]
Office Properties Income Trust [Member]
Marketable Securities [Line Items]
Number of Shares	562		562
Cost	$ 36,418		$ 36,418
Market Value	$ 13,948		$ 12,757
Orion Office REIT Inc [Member]
Marketable Securities [Line Items]
Number of Shares	18
Cost	$ 293
Market Value	$ 345
Pennsylvania Real Estate Investment Trust [Member]
Marketable Securities [Line Items]
Number of Shares	222		222
Cost	$ 2,316		$ 2,316
Market Value	$ 226		$ 222
Diversified Healthcare Trust [Member]
Marketable Securities [Line Items]
Number of Shares	171		171
Cost	$ 2,920		$ 2,920
Market Value	$ 528		$ 704
Urstadt Biddle Properties Inc [Member]
Marketable Securities [Line Items]
Number of Shares	100		100
Cost	$ 2,049		$ 2,049
Market Value	$ 2,130		$ 1,413
Realty Income Corporation [Member]
Marketable Securities [Line Items]
Number of Shares	185
Cost	$ 10,910
Market Value	$ 13,224
Washington Prime Group [Member]
Marketable Securities [Line Items]
Number of Shares	3		89
Cost	$ 6,489		$ 6,489
Market Value	0		579
Common Stock [Member]
Marketable Securities [Line Items]
Cost	125,326		137,470
Market Value	$ 112,008		$ 100,571
CBL Associates Properties Inc Series D [Member]
Marketable Securities [Line Items]
Interest Rate			7.375%
Number of Shares			2
Cost			$ 50
Market Value			$ 2
CBL and Associates Properties, Inc Preferred Stock Series E [Member]
Marketable Securities [Line Items]
Interest Rate			6.625%
Number of Shares			63
Cost			$ 1,487
Market Value			$ 50
Colony Capital Inc. Preferred Stock Series I [Member]
Marketable Securities [Line Items]
Interest Rate			7.15%
Number of Shares			20
Cost			$ 500
Market Value			$ 472
Urstadt Biddle Properties, Inc Series H [Member]
Marketable Securities [Line Items]
Interest Rate			6.25%
Number of Shares			13
Cost			$ 313
Market Value			$ 313
Tanger Factory Outlet [Member]
Marketable Securities [Line Items]
Number of Shares			180
Cost			$ 4,229
Market Value			$ 1,793
Vereit, Inc [Member]
Marketable Securities [Line Items]
Number of Shares			282
Cost			$ 12,059
Market Value			$ 10,657

[1] Related entity – See Note 9.

[2] Related entity – See Note 9.