INVESTMENT IN UNCONSOLIDATED JOINT VENTURES (Income) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Oct. 28, 2009	Mar. 02, 2005	Sep. 30, 2004	Aug. 31, 2004	Nov. 30, 2001
Revenues
Rental income	$ 15,333,216	$ 15,646,814	$ 30,313,332	$ 31,900,244
Laundry and sundry income	114,128	112,292	222,801	234,446
Total Revenues	15,447,344	15,759,106	30,536,133	32,134,690
Expenses
Administrative	559,818	512,195	1,212,004	1,096,853
Depreciation and amortization	3,943,664	4,601,617	7,849,582	9,167,084
Management fee	616,348	615,541	1,221,739	1,264,534
Operating	1,407,646	1,291,781	3,453,614	2,960,183
Renting	221,275	128,608	483,241	325,479
Repairs and maintenance	2,334,403	2,049,174	4,304,490	4,135,392
Taxes and insurance	2,176,958	2,115,721	4,429,092	4,396,262
Total Expenses	11,260,112	11,314,637	22,953,762	23,345,787
Income Before Other Income (Expense)	4,187,232	4,444,469	7,582,371	8,788,903
Other Income (Expense)
Interest expense	(3,378,942)	(3,423,583)	(6,743,111)	(6,873,908)
Interest income	25	52	46	159
Total Other Income (Expense)	(3,617,341)	(2,979,418)	(7,306,660)	(5,955,069)
Net Inocme (Loss)	$ 569,891	$ 1,465,051	$ 275,711	$ 2,833,834
NERA 50%
Other Income (Expense)
Ownership interest (as a percent)	50.00%	50.00%	50.00%	50.00%
NERA 40%
Other Income (Expense)
Ownership interest (as a percent)	40.00%	40.00%	40.00%	40.00%
Investment Properties
Revenues
Rental income	$ 4,913,233	$ 6,038,075	$ 9,672,132	$ 12,389,532
Laundry and sundry income	37,697	32,667	77,027	70,997
Total Revenues	4,950,930	6,070,742	9,749,159	12,460,529
Expenses
Administrative	117,823	79,862	209,404	169,962
Depreciation and amortization	1,499,047	1,484,331	2,987,724	2,961,219
Management fee	129,279	150,347	256,530	321,175
Operating	364,000	368,244	864,666	833,252
Renting	170,459	26,161	333,647	65,212
Repairs and maintenance	709,254	416,490	1,379,824	897,819
Taxes and insurance	875,923	832,830	1,747,711	1,691,854
Total Expenses	3,865,785	3,358,265	7,779,506	6,940,493
Income Before Other Income (Expense)	1,085,145	2,712,477	1,969,653	5,520,036
Other Income (Expense)
Interest expense	(1,664,696)	(1,682,669)	(3,327,363)	(3,396,574)
Interest income	1,222
Other Income			1,222
Total Other Income (Expense)	(1,663,474)	(1,682,669)	(3,326,141)	(3,396,574)
Net Inocme (Loss)	(578,329)	1,029,808	(1,356,488)	2,123,462
Proportionate share of net income (loss)	(238,424)	444,113	(563,595)	918,680
Investment Properties | NERA 50%
Other Income (Expense)
Net Inocme (Loss)	(35,465)	160,951		346,478
Proportionate share of net income (loss)			(105,000)
Investment Properties | NERA 40%
Other Income (Expense)
Net Inocme (Loss)	(202,959)	283,162		572,202
Proportionate share of net income (loss)			(458,595)
Hamilton Essex 81
Revenues
Rental income	211,855	380,708	442,072	820,088
Laundry and sundry income	3,195	3,298	6,208	6,683
Total Revenues	215,050	384,006	448,280	826,771
Expenses
Administrative	39,313	5,293	53,869	11,480
Depreciation and amortization	119,580	121,927	238,522	243,569
Management fee	6,586	10,316	11,846	28,052
Operating	39,736	20,776	69,168	46,299
Renting	22,093	629	54,877	3,404
Repairs and maintenance	29,585	40,200	82,132	67,209
Taxes and insurance	65,636	64,724	131,175	129,401
Total Expenses	322,529	263,865	641,589	529,414
Income Before Other Income (Expense)	(107,479)	120,141	(193,309)	297,357
Other Income (Expense)
Interest expense	(61,402)	(71,358)	(122,715)	(172,091)
Total Other Income (Expense)	(61,402)	(71,358)	(122,715)	(172,091)
Net Inocme (Loss)	(168,881)	$ 48,783	(316,024)	$ 125,266
Ownership interest (as a percent)		50.00%		50.00%
Hamilton Essex 81 | NERA 50%
Other Income (Expense)
Net Inocme (Loss)	$ (84,441)	$ 24,392		$ 62,633
Proportionate share of net income (loss)			$ (158,012)
Ownership interest (as a percent)	50.00%		50.00%
Hamilton Essex Development
Revenues
Rental income	$ 57,240	5,391	$ 57,240	65,862
Total Revenues	57,240	5,391	57,240	65,862
Expenses
Administrative	500	1,550	1,353	2,200
Depreciation and amortization	5,075	5,075	10,149	10,149
Management fee				2,203
Repairs and maintenance	520	3,046	520	3,046
Taxes and insurance	14,925	15,238	29,811	30,457
Total Expenses	21,020	24,909	41,833	48,055
Income Before Other Income (Expense)	36,220	(19,518)	15,407	17,807
Other Income (Expense)
Net Inocme (Loss)	36,220	$ (19,518)	15,407	$ 17,807
Ownership interest (as a percent)		50.00%		50.00%
Hamilton Essex Development | NERA 50%
Other Income (Expense)
Net Inocme (Loss)	$ 18,110	$ (9,759)		$ 8,904
Proportionate share of net income (loss)			$ 7,704
Ownership interest (as a percent)	50.00%		50.00%
345 Franklin
Revenues
Rental income	$ 342,698	419,342	$ 675,791	847,492
Laundry and sundry income		171	112	625
Total Revenues	342,698	419,513	675,903	848,117
Expenses
Administrative	10,719	8,572	15,522	16,328
Depreciation and amortization	85,520	84,541	170,865	169,036
Management fee	13,933	15,829	26,345	32,296
Operating	12,556	15,776	26,077	28,764
Renting	19,606	929	33,934	9,682
Repairs and maintenance	41,218	21,797	64,496	43,375
Taxes and insurance	43,709	39,808	87,380	79,714
Total Expenses	227,261	187,252	424,619	379,195
Income Before Other Income (Expense)	115,437	232,261	251,284	468,922
Other Income (Expense)
Interest expense	(90,102)	(92,983)	(180,745)	(186,408)
Total Other Income (Expense)	(90,102)	(92,983)	(180,745)	(186,408)
Net Inocme (Loss)	25,335	$ 139,278	70,539	$ 282,514
Ownership interest (as a percent)		50.00%		50.00%					50.00%
345 Franklin | NERA 50%
Other Income (Expense)
Net Inocme (Loss)	$ 12,668	$ 69,638		$ 141,257
Proportionate share of net income (loss)			$ 35,270
Ownership interest (as a percent)	50.00%		50.00%
Hamilton 1025
Revenues
Rental income	$ 24,369	20,558	$ 48,739	41,117
Total Revenues	24,369	20,558	48,739	41,117
Expenses
Administrative	775	931	1,490	11,056
Depreciation and amortization	816	816	1,632	1,632
Management fee	942	822	1,571	1,645
Operating	85	51	176	96
Taxes and insurance	5,104	4,492	9,901	8,680
Total Expenses	7,722	7,112	14,770	23,109
Income Before Other Income (Expense)	16,647	13,446	33,969	18,008
Other Income (Expense)
Net Inocme (Loss)	16,647	$ 13,446	33,969	$ 18,008
Ownership interest (as a percent)		50.00%		50.00%		50.00%
Hamilton 1025 | NERA 50%
Other Income (Expense)
Net Inocme (Loss)	$ 8,324	$ 6,723		$ 9,004
Proportionate share of net income (loss)			$ 16,985
Ownership interest (as a percent)	50.00%		50.00%
Hamilton Minuteman
Revenues
Rental income	$ 286,684	290,517	$ 571,208	581,210
Laundry and sundry income	2,029	626	3,305	626
Total Revenues	288,713	291,143	574,513	581,836
Expenses
Administrative	4,077	4,168	7,660	6,650
Depreciation and amortization	84,328	86,954	168,353	173,780
Management fee	11,579	11,472	22,875	23,004
Operating	19,900	28,428	54,496	50,654
Renting	360	2,750	720	5,750
Repairs and maintenance	36,977	28,056	56,381	38,950
Taxes and insurance	35,237	36,125	70,212	72,176
Total Expenses	192,458	197,953	380,697	370,964
Income Before Other Income (Expense)	96,255	93,190	193,816	210,872
Other Income (Expense)
Interest expense	(59,252)	(59,242)	(117,877)	(118,502)
Total Other Income (Expense)	(59,252)	(59,242)	(117,877)	(118,502)
Net Inocme (Loss)	37,003	$ 33,948	75,939	$ 92,370
Ownership interest (as a percent)		50.00%		50.00%			50.00%
Hamilton Minuteman | NERA 50%
Other Income (Expense)
Net Inocme (Loss)	$ 18,502	$ 16,974		$ 46,185
Proportionate share of net income (loss)			$ 37,969
Ownership interest (as a percent)	50.00%		50.00%
Hamilton on Main Apts
Revenues
Rental income	$ 847,462	897,613	$ 1,664,274	1,803,314
Laundry and sundry income	9,264	8,606	18,041	17,355
Total Revenues	856,726	906,219	1,682,315	1,820,669
Expenses
Administrative	14,561	13,627	34,780	29,475
Depreciation and amortization	270,646	263,086	540,561	524,133
Management fee	32,055	32,745	64,431	67,729
Operating	88,756	83,750	213,689	177,595
Renting	20,798	7,773	51,559	15,493
Repairs and maintenance	146,578	99,155	269,025	233,991
Taxes and insurance	111,171	109,712	221,305	232,474
Total Expenses	684,565	609,848	1,395,350	1,280,890
Income Before Other Income (Expense)	172,161	296,371	286,965	539,779
Other Income (Expense)
Interest expense	(189,415)	(190,404)	(376,793)	(382,787)
Total Other Income (Expense)	(189,415)	(190,404)	(376,793)	(382,787)
Net Inocme (Loss)	(17,254)	$ 105,967	(89,828)	$ 156,992
Ownership interest (as a percent)		50.00%		50.00%				50.00%
Hamilton on Main Apts | NERA 50%
Other Income (Expense)
Net Inocme (Loss)	$ (8,627)	$ 52,984		$ 78,496
Proportionate share of net income (loss)			$ (44,914)
Ownership interest (as a percent)	50.00%		50.00%
Dexter Park
Revenues
Rental income	$ 3,142,925	4,023,946	$ 6,212,808	8,230,449
Laundry and sundry income	23,209	19,966	49,361	45,708
Total Revenues	3,166,134	4,043,912	6,262,169	8,276,157
Expenses
Administrative	47,878	45,721	94,730	92,773
Depreciation and amortization	933,082	921,932	1,857,642	1,838,920
Management fee	64,184	79,163	129,462	166,246
Operating	202,967	219,463	501,060	529,844
Renting	107,602	14,080	192,557	30,883
Repairs and maintenance	454,376	224,236	907,270	511,248
Taxes and insurance	600,141	562,731	1,197,927	1,138,952
Total Expenses	2,410,230	2,067,326	4,880,648	4,308,866
Income Before Other Income (Expense)	755,904	1,976,586	1,381,521	3,967,291
Other Income (Expense)
Interest expense	(1,264,525)	(1,268,682)	(2,529,233)	(2,536,786)
Interest income	1,222
Other Income			1,222
Total Other Income (Expense)	(1,263,303)	(1,268,682)	(2,528,011)	(2,536,786)
Net Inocme (Loss)	(507,399)	$ 707,904	(1,146,490)	$ 1,430,505
Ownership interest (as a percent)		40.00%		40.00%	40.00%
Dexter Park | NERA 40%
Other Income (Expense)
Net Inocme (Loss)	$ (202,959)	$ 283,162		$ 572,202
Proportionate share of net income (loss)			$ (458,595)
Ownership interest (as a percent)	40.00%		40.00%