INVESTMENT IN UNCONSOLIDATED JOINT VENTURES (Income) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Oct. 28, 2009	Mar. 02, 2005	Sep. 30, 2004	Aug. 31, 2004	Nov. 30, 2001
Revenues
Rental income	$ 15,832,492	$ 15,046,646	$ 46,145,825	$ 46,946,889
Laundry and sundry income	114,180	95,620	336,980	330,066
Total Revenues	15,946,672	15,142,266	46,482,805	47,276,955
Expenses
Administrative	607,478	511,812	1,819,481	1,608,664
Depreciation and amortization	3,956,979	4,612,713	11,806,561	13,779,797
Management fee	646,059	598,111	1,867,798	1,862,645
Operating	1,338,718	1,228,750	4,792,332	4,188,934
Renting	458,040	332,157	941,281	657,636
Repairs and maintenance	3,128,369	2,524,050	7,432,860	6,659,443
Taxes and insurance	2,259,793	2,107,037	6,688,885	6,503,299
Total Expenses	12,395,436	11,914,630	35,349,198	35,260,418
Income Before Other Income (Expense)	3,551,236	3,227,636	11,133,607	12,016,537
Other Income (Expense)
Interest expense	(3,393,518)	(3,417,348)	(10,136,630)	(10,291,255)
Interest income	27	11	74	171
Total Other Income (Expense)	(3,626,621)	(3,666,920)	(10,933,281)	(9,621,986)
Net Inocme (Loss)	$ (75,385)	$ (439,284)	$ 200,326	$ 2,394,551
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	$ 5,317,161	$ 5,075,210	$ 14,989,292	$ 17,464,869
Laundry and sundry income	37,731	27,233	114,758	98,102
Total Revenues	5,354,892	5,102,443	15,104,050	17,562,971
Expenses
Administrative	109,128	74,345	318,532	244,308
Depreciation and amortization	1,508,364	1,489,963	4,496,088	4,451,183
Management fee	156,796	136,989	413,328	458,162
Operating	462,631	385,519	1,327,298	1,218,772
Renting	281,698	242,466	615,345	307,678
Repairs and maintenance	884,014	833,173	2,263,838	1,730,992
Taxes and insurance	895,491	850,624	2,643,200	2,542,476
Total Expenses	4,298,122	4,013,079	12,077,629	10,953,571
Income Before Other Income (Expense)	1,056,770	1,089,364	3,026,421	6,609,400
Other Income (Expense)
Interest expense	(1,665,791)	(1,675,322)	(4,993,153)	(5,071,896)
Other Income			1,222
Total Other Income (Expense)	(1,665,791)	(1,675,322)	(4,991,931)	(5,071,896)
Net Inocme (Loss)	(609,021)	(585,958)	(1,965,510)	1,537,504
Proportionate share of net income (loss)	(233,130)	(249,583)	(796,725)	669,098
Investment Properties | NERA 50%
Other Income (Expense)
Net Inocme (Loss)	52,403	(76,005)		270,473
Proportionate share of net income (loss)			(52,597)
Investment Properties | NERA 40%
Other Income (Expense)
Net Inocme (Loss)	(285,533)	(173,578)		398,625
Proportionate share of net income (loss)			(744,128)
Hamilton Essex 81
Revenues
Rental income	414,497	120,398	856,569	940,486
Laundry and sundry income	2,986	2,605	9,194	9,288
Total Revenues	417,483	123,003	865,763	949,774
Expenses
Administrative	16,576	3,971	70,445	15,451
Depreciation and amortization	120,266	122,210	358,788	365,779
Management fee	17,335	9,751	29,181	37,803
Operating	60,232	17,948	129,400	64,247
Renting	26,272	3,026	81,149	6,430
Repairs and maintenance	41,335	27,206	123,467	94,415
Taxes and insurance	64,799	63,090	195,974	192,490
Total Expenses	346,815	247,202	988,404	776,615
Income Before Other Income (Expense)	70,668	(124,199)	(122,641)	173,159
Other Income (Expense)
Interest expense	(61,827)	(63,961)	(184,542)	(236,053)
Total Other Income (Expense)	(61,827)	(63,961)	(184,542)	(236,053)
Net Inocme (Loss)	8,841	$ (188,160)	(307,183)	$ (62,894)
Ownership interest (as a percent)		50.00%		50.00%
Hamilton Essex 81 | NERA 50%
Other Income (Expense)
Net Inocme (Loss)	$ 4,421	$ (94,080)		$ (31,447)
Proportionate share of net income (loss)			$ (153,593)
Ownership interest (as a percent)	50.00%		50.00%
Hamilton Essex Development
Revenues
Rental income	$ 111,191	2,864	$ 168,431	68,726
Total Revenues	111,191	2,864	168,431	68,726
Expenses
Administrative	750	844	2,103	3,044
Depreciation and amortization	5,074	5,074	15,223	15,223
Management fee	6,187		6,187	2,203
Repairs and maintenance		134	520	3,180
Taxes and insurance	15,228	15,328	45,037	45,784
Total Expenses	27,239	21,380	69,070	69,434
Income Before Other Income (Expense)	83,952	(18,516)	99,361	(708)
Other Income (Expense)
Net Inocme (Loss)	83,952	$ (18,516)	99,361	$ (708)
Ownership interest (as a percent)		50.00%		50.00%
Hamilton Essex Development | NERA 50%
Other Income (Expense)
Net Inocme (Loss)	$ 41,976	$ (9,257)		$ (354)
Proportionate share of net income (loss)			$ 49,681
Ownership interest (as a percent)	50.00%		50.00%
345 Franklin
Revenues
Rental income	$ 343,674	334,431	$ 1,019,465	1,182,050
Laundry and sundry income			112	498
Total Revenues	343,674	334,431	1,019,577	1,182,548
Expenses
Administrative	7,129	7,531	22,651	23,860
Depreciation and amortization	86,449	84,680	257,314	253,716
Management fee	13,943	13,253	40,288	45,548
Operating	16,060	22,313	42,137	51,077
Renting	12,174	20,094	46,108	29,776
Repairs and maintenance	35,687	35,879	100,182	79,254
Taxes and insurance	44,194	40,342	131,574	120,056
Total Expenses	215,636	224,092	640,254	603,287
Income Before Other Income (Expense)	128,038	110,339	379,323	579,261
Other Income (Expense)
Interest expense	(89,248)	(92,048)	(269,993)	(278,456)
Total Other Income (Expense)	(89,248)	(92,048)	(269,993)	(278,456)
Net Inocme (Loss)	38,790	$ 18,291	109,330	$ 300,805
Ownership interest (as a percent)		50.00%		50.00%					50.00%
345 Franklin | NERA 50%
Other Income (Expense)
Net Inocme (Loss)	$ 19,395	$ 9,146		$ 150,403
Proportionate share of net income (loss)			$ 54,665
Ownership interest (as a percent)	50.00%		50.00%
Hamilton 1025
Revenues
Rental income	$ 26,410	24,369	$ 75,148	65,486
Total Revenues	26,410	24,369	75,148	65,486
Expenses
Administrative	651	713	2,140	11,769
Depreciation and amortization	816	816	2,448	2,448
Management fee	1,272	942	2,843	2,587
Operating	55	51	231	147
Taxes and insurance	4,634	4,021	14,535	12,701
Total Expenses	7,428	6,543	22,197	29,652
Income Before Other Income (Expense)	18,982	17,826	52,951	35,834
Other Income (Expense)
Net Inocme (Loss)	18,982	$ 17,826	52,951	$ 35,834
Ownership interest (as a percent)		50.00%		50.00%		50.00%
Hamilton 1025 | NERA 50%
Other Income (Expense)
Net Inocme (Loss)	$ 9,491	$ 8,913		$ 17,917
Proportionate share of net income (loss)			$ 26,476
Ownership interest (as a percent)	50.00%		50.00%
Hamilton Minuteman
Revenues
Rental income	$ 293,988	301,865	$ 865,196	883,075
Laundry and sundry income	1,243	1,289	4,548	1,915
Total Revenues	295,231	303,154	869,744	884,990
Expenses
Administrative	3,824	3,631	11,485	10,281
Depreciation and amortization	84,827	87,214	253,180	260,994
Management fee	11,716	12,209	34,592	35,212
Operating	23,542	18,832	78,038	69,487
Renting	375	1,690	1,095	7,440
Repairs and maintenance	30,184	32,161	86,566	71,112
Taxes and insurance	36,986	36,038	107,198	108,214
Total Expenses	191,454	191,775	572,154	562,740
Income Before Other Income (Expense)	103,777	111,379	297,590	322,250
Other Income (Expense)
Interest expense	(59,880)	(59,900)	(177,757)	(178,402)
Total Other Income (Expense)	(59,880)	(59,900)	(177,757)	(178,402)
Net Inocme (Loss)	43,897	$ 51,479	119,833	$ 143,848
Ownership interest (as a percent)		50.00%		50.00%			50.00%
Hamilton Minuteman | NERA 50%
Other Income (Expense)
Net Inocme (Loss)	$ 21,949	$ 25,740		$ 71,924
Proportionate share of net income (loss)			$ 59,917
Ownership interest (as a percent)	50.00%		50.00%
Hamilton on Main Apts
Revenues
Rental income	$ 827,140	844,963	$ 2,491,414	2,648,277
Laundry and sundry income	9,796	8,780	27,837	26,135
Total Revenues	836,936	853,743	2,519,251	2,674,412
Expenses
Administrative	14,592	13,991	49,372	43,466
Depreciation and amortization	272,874	264,047	813,435	788,181
Management fee	32,831	32,925	97,262	100,654
Operating	101,948	78,199	315,638	255,794
Renting	20,213	36,709	71,772	52,202
Repairs and maintenance	177,652	154,828	446,677	388,818
Taxes and insurance	115,028	114,523	336,333	346,997
Total Expenses	735,138	695,222	2,130,489	1,976,112
Income Before Other Income (Expense)	101,798	158,521	388,762	698,300
Other Income (Expense)
Interest expense	(191,453)	(191,453)	(568,246)	(574,239)
Total Other Income (Expense)	(191,453)	(191,453)	(568,246)	(574,239)
Net Inocme (Loss)	(89,655)	$ (32,932)	(179,484)	$ 124,061
Ownership interest (as a percent)		50.00%		50.00%				50.00%
Hamilton on Main Apts | NERA 50%
Other Income (Expense)
Net Inocme (Loss)	$ (44,829)	$ (16,466)		$ 62,031
Proportionate share of net income (loss)			$ (89,742)
Ownership interest (as a percent)	50.00%		50.00%
Dexter Park
Revenues
Rental income	$ 3,300,261	3,446,320	$ 9,513,069	11,676,769
Laundry and sundry income	23,706	14,559	73,067	60,266
Total Revenues	3,323,967	3,460,879	9,586,136	11,737,035
Expenses
Administrative	65,606	43,664	160,336	136,437
Depreciation and amortization	938,058	925,922	2,795,700	2,764,842
Management fee	73,512	67,909	202,975	234,155
Operating	260,794	248,176	761,854	778,020
Renting	222,664	180,947	415,221	211,830
Repairs and maintenance	599,156	582,965	1,506,426	1,094,213
Taxes and insurance	614,622	577,282	1,812,549	1,716,234
Total Expenses	2,774,412	2,626,865	7,655,061	6,935,731
Income Before Other Income (Expense)	549,555	834,014	1,931,075	4,801,304
Other Income (Expense)
Interest expense	(1,263,383)	(1,267,960)	(3,792,615)	(3,804,746)
Other Income			1,222
Total Other Income (Expense)	(1,263,383)	(1,267,960)	(3,791,393)	(3,804,746)
Net Inocme (Loss)	(713,828)	$ (433,946)	(1,860,318)	$ 996,558
Ownership interest (as a percent)		40.00%		40.00%	40.00%
Dexter Park | NERA 40%
Other Income (Expense)
Net Inocme (Loss)	$ (285,533)	$ (173,578)		$ 398,625
Proportionate share of net income (loss)			$ (744,128)
Ownership interest (as a percent)	40.00%		40.00%