INVESTMENT IN UNCONSOLIDATED JOINT VENTURES (Income) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Oct. 28, 2009	Oct. 03, 2005	Mar. 02, 2005	Sep. 30, 2004	Aug. 31, 2004	Nov. 30, 2001
Revenues
Rental income	$ 24,648,947	$ 23,919,253	$ 23,376,262
Laundry and Sundry Income	165,096	163,958	162,523
Total Revenues	24,814,043	24,083,211	23,538,785
Expenses
Administrative	377,298	360,792	316,569
Depreciation and amortization	5,903,401	5,832,195	5,884,897
Management Fees	664,341	652,200	660,006
Operating	1,791,071	1,942,878	1,740,939
Renting	495,103	645,890	401,263
Repairs and Maintenance	2,511,741	2,666,148	2,959,112
Taxes and Insurance	3,074,653	2,827,058	2,963,065
Total Expenses	14,817,608	14,927,161	14,925,851
Income Before Other Income	9,996,435	9,156,050	8,612,934
Other Income (loss)
Interest Expense	(6,915,193)	(6,866,175)	(6,573,197)
Other Income (Expense)		(3,829,950)
Gain on Sale of Real Estate	734,635	4,410,541	6,140,253
Total Other Income (Loss)	(6,180,558)	(6,285,584)	(432,944)
Net Income (Loss)	3,815,877	2,870,466	8,179,990
Proportionate share of net income (loss)	1,678,554	1,640,054	3,905,827
NERA 50%
Other Income (loss)
Proportionate share of net income (loss)	$ 761,014	$ 2,459,336	$ 3,169,159
Ownership interest (as a percent)	50.00%	50.00%	50.00%
NERA 40%
Other Income (loss)
Proportionate share of net income (loss)	$ 917,540	$ (819,282)	$ 736,668
Ownership interest (as a percent)	40.00%	40.00%	40.00%
Hamilton Essex 81
Revenues
Rental income	$ 1,743,610	$ 1,654,459	$ 1,404,006
Laundry and Sundry Income	14,350	14,595	15,424
Total Revenues	1,757,960	1,669,054	1,419,430
Expenses
Administrative	29,307	21,146	26,760
Depreciation and amortization	483,748	475,646	456,728
Management Fees	69,039	59,246	59,873
Operating	89,002	78,979	70,847
Renting	43,534	41,946	37,474
Repairs and Maintenance	152,930	159,486	188,763
Taxes and Insurance	245,086	247,729	239,875
Total Expenses	1,112,646	1,084,178	1,080,320
Income Before Other Income	645,314	584,876	339,110
Other Income (loss)
Interest Expense	(466,737)	(440,676)	(349,303)
Total Other Income (Loss)	(466,737)	(440,676)	(349,303)
Net Income (Loss)	$ 178,577	$ 144,200	$ (10,193)
Ownership interest (as a percent)	50.00%	50.00%	50.00%
Hamilton Essex 81 | NERA 50%
Other Income (loss)
Proportionate share of net income (loss)	$ 89,289	$ 72,100	$ (5,097)
Hamilton Essex Development
Revenues
Rental income	222,183	244,137	227,856
Total Revenues	222,183	244,137	227,856
Expenses
Administrative	25,369	9,280	26,065
Depreciation and amortization	20,297	8,706	2,830
Management Fees	8,683	8,632	9,114
Operating	8
Renting		37,353
Repairs and Maintenance	3,180	8,643	3,668
Taxes and Insurance	61,493	64,529	58,538
Total Expenses	119,030	137,143	100,215
Income Before Other Income	103,153	106,994	127,641
Other Income (loss)
Net Income (Loss)	$ 103,153	$ 106,994	$ 127,641
Ownership interest (as a percent)	50.00%	50.00%	50.00%
Hamilton Essex Development | NERA 50%
Other Income (loss)
Proportionate share of net income (loss)	$ 51,577	$ 53,497	$ 63,821
345 Franklin
Revenues
Rental income	1,613,295	1,567,718	1,473,098
Laundry and Sundry Income	2,844	5,410	5,380
Total Revenues	1,616,139	1,573,128	1,478,478
Expenses
Administrative	24,610	27,601	25,686
Depreciation and amortization	345,282	347,547	348,502
Management Fees	62,486	65,058	61,513
Operating	80,581	76,512	70,599
Renting	36,918	44,869	36,194
Repairs and Maintenance	125,474	130,926	109,039
Taxes and Insurance	154,731	147,217	138,503
Total Expenses	830,082	839,730	790,036
Income Before Other Income	786,057	733,398	688,442
Other Income (loss)
Interest Expense	(377,448)	(384,824)	(393,193)
Total Other Income (Loss)	(377,448)	(384,824)	(393,193)
Net Income (Loss)	$ 408,609	$ 348,574	$ 295,249
Ownership interest (as a percent)	50.00%	50.00%	50.00%						50.00%
345 Franklin | NERA 50%
Other Income (loss)
Proportionate share of net income (loss)	$ 204,305	$ 174,287	$ 147,625
Hamilton 1025
Revenues
Rental income	93,116	112,785	352,888
Total Revenues	93,116	112,785	352,888
Expenses
Administrative	7,497	5,939	4,142
Depreciation and amortization	7,655		82,383
Management Fees	3,556	4,503	13,056
Operating	974	1,606	458
Renting	64	108	392
Repairs and Maintenance	28,399	94,680	227,346
Taxes and Insurance	22,213	46,164	99,646
Total Expenses	70,358	153,000	427,423
Income Before Other Income	22,758	(40,215)	(74,535)
Other Income (loss)
Gain on Sale of Real Estate	306,075	1,972,876	2,378,753
Total Other Income (Loss)	306,075	1,972,876	2,378,753
Net Income (Loss)	$ 328,833	$ 1,932,662	$ 2,304,219
Ownership interest (as a percent)	50.00%	50.00%	50.00%			50.00%
Hamilton 1025 | NERA 50%
Other Income (loss)
Proportionate share of net income (loss)	$ 164,417	$ 966,331	$ 1,152,109
Hamilton Bay Sales
Revenues
Rental income			5,557
Total Revenues			5,557
Expenses
Administrative			6,326
Depreciation and amortization			81,655
Management Fees			253
Operating			38
Renting			181
Repairs and Maintenance			3,326
Taxes and Insurance			1,850
Total Expenses			93,629
Income Before Other Income			(88,072)
Other Income (loss)
Gain on Sale of Real Estate			133,295
Total Other Income (Loss)			133,295
Net Income (Loss)			45,223
Hamilton Bay Sales | NERA 50%
Other Income (loss)
Proportionate share of net income (loss)			22,612
Hamilton Bay Apts
Revenues
Rental income	3,541	74,812	544,482
Total Revenues	3,541	74,812	544,482
Expenses
Administrative	6,147	12,566	8,617
Depreciation and amortization		30,000	181,152
Management Fees	145	3,091	19,947
Operating		1,435	4,239
Renting			241
Repairs and Maintenance	10,266	92,268	303,174
Taxes and Insurance	5,206	36,094	140,904
Total Expenses	21,764	175,454	658,274
Income Before Other Income	(18,223)	(100,642)	(113,792)
Other Income (loss)
Interest Expense			(41,957)
Gain on Sale of Real Estate	428,560	2,437,665	3,628,205
Total Other Income (Loss)	428,560	2,437,665	3,586,248
Net Income (Loss)	$ 410,337	$ 2,337,023	$ 3,472,456
Ownership interest (as a percent)	50.00%	50.00%	50.00%		50.00%
Hamilton Bay Apts | NERA 50%
Other Income (loss)
Proportionate share of net income (loss)	$ 205,169	$ 1,168,512	$ 1,736,228
Hamilton Minuteman
Revenues
Rental income	1,136,912	1,077,105	1,024,570
Laundry and Sundry Income	6,033	(364)	2,620
Total Revenues	1,142,945	1,076,741	1,027,190
Expenses
Administrative	7,722	5,449	5,671
Depreciation and amortization	357,932	355,463	349,910
Management Fees	45,624	42,852	39,976
Operating	83,872	93,795	87,284
Renting	5,324	5,940	7,992
Repairs and Maintenance	133,812	121,222	81,647
Taxes and Insurance	131,821	127,505	127,947
Total Expenses	766,107	752,226	700,427
Income Before Other Income	376,838	324,515	326,763
Other Income (loss)
Interest Expense	(235,883)	(237,707)	(237,293)
Total Other Income (Loss)	(235,883)	(237,707)	(237,293)
Net Income (Loss)	$ 140,955	$ 86,808	$ 89,469
Ownership interest (as a percent)	50.00%	50.00%	50.00%				50.00%
Hamilton Minuteman | NERA 50%
Other Income (loss)
Proportionate share of net income (loss)	$ 70,478	$ 43,404	$ 44,735
Hamilton on Main Apts
Revenues
Rental income	3,429,864	3,419,218	3,359,971
Laundry and Sundry Income	41,174	38,080	37,968
Total Revenues	3,471,038	3,457,298	3,397,939
Expenses
Administrative	68,877	56,339	33,688
Depreciation and amortization	1,046,022	1,032,394	1,005,595
Management Fees	132,195	131,500	133,138
Operating	398,286	388,387	360,706
Renting	47,817	25,947	36,767
Repairs and Maintenance	651,948	663,314	606,570
Taxes and Insurance	404,805	426,665	436,266
Total Expenses	2,749,950	2,724,546	2,612,730
Income Before Other Income	721,088	732,752	785,209
Other Income (loss)
Interest Expense	(769,526)	(770,342)	(770,953)
Total Other Income (Loss)	(769,526)	(770,342)	(770,953)
Net Income (Loss)	$ (48,438)	$ (37,590)	$ 14,256
Ownership interest (as a percent)	50.00%	50.00%	50.00%					50.00%
Hamilton on Main Apts | NERA 50%
Other Income (loss)
Proportionate share of net income (loss)	$ (24,219)	$ (18,795)	$ 7,127
Dexter Park
Revenues
Rental income	16,406,426	15,769,019	14,983,834
Laundry and Sundry Income	100,695	106,237	101,131
Total Revenues	16,507,121	15,875,256	15,084,965
Expenses
Administrative	207,769	222,472	179,614
Depreciation and amortization	3,642,465	3,582,439	3,376,142
Management Fees	342,613	337,318	323,136
Operating	1,138,348	1,302,164	1,146,768
Renting	361,446	489,727	282,022
Repairs and Maintenance	1,405,732	1,395,609	1,435,579
Taxes and Insurance	2,049,298	1,731,155	1,719,536
Total Expenses	9,147,671	9,060,884	8,462,797
Income Before Other Income	7,359,450	6,814,372	6,622,168
Other Income (loss)
Interest Expense	(5,065,599)	(5,032,626)	(4,780,498)
Other Income (Expense)		(3,829,950)
Total Other Income (Loss)	(5,065,599)	(8,862,576)	(4,780,498)
Net Income (Loss)	$ 2,293,851	$ (2,048,204)	$ 1,841,672
Ownership interest (as a percent)	40.00%	40.00%	40.00%	40.00%
Dexter Park | NERA 40%
Other Income (loss)
Proportionate share of net income (loss)	$ 917,540	$ (819,282)	$ 736,668