INVESTMENT IN UNCONSOLIDATED JOINT VENTURES (Income) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Oct. 28, 2009	Oct. 03, 2005	Mar. 02, 2005	Sep. 30, 2004	Aug. 31, 2004	Nov. 30, 2001
Revenues
Rental income	$ 23,919,253	$ 23,376,262	$ 24,015,295
Laundry and Sundry Income	163,958	162,523	170,727
Total Revenues	24,083,211	23,538,785	24,186,022
Expenses
Administrative	360,792	316,569	336,837
Depreciation and amortization	5,832,195	5,884,897	5,856,136
Management Fees	652,200	660,006	692,250
Operating	1,942,878	1,740,939	1,770,827
Renting	645,890	401,263	331,500
Repairs and Maintenance	2,666,148	2,959,112	2,994,069
Taxes and Insurance	2,827,058	2,963,065	2,892,136
Total Expenses	14,927,161	14,925,851	14,873,755
Income Before Other Income	9,156,050	8,612,934	9,312,267
Other Income (loss)
Interest Expense	(6,866,326)	(6,574,209)	(7,032,305)
Interest Income			10
Other Income (Expense)	(3,829,950)
Gain on Sale of Real Estate	4,410,692	6,141,265	1,661,425
Total Other Income (Loss)	(6,285,584)	(432,944)	(5,370,870)
Net Income (Loss)	2,870,466	8,179,990	3,941,397
Proportionate share of net income (loss)	1,640,054	3,905,827	1,785,827
NERA 50%
Other Income (loss)
Proportionate share of net income (loss)	2,459,336	$ 3,169,159	1,046,345
Ownership interest (as a percent)		50.00%
NERA 40%
Other Income (loss)
Proportionate share of net income (loss)	(819,282)	$ 736,668	739,482
Ownership interest (as a percent)		40.00%
Hamilton Essex 81
Revenues
Rental income	1,654,459	$ 1,404,006	1,534,910
Laundry and Sundry Income	14,595	15,424	15,263
Total Revenues	1,669,054	1,419,430	1,550,173
Expenses
Administrative	21,146	26,760	31,400
Depreciation and amortization	475,646	456,728	452,186
Management Fees	59,246	59,873	63,880
Operating	78,979	70,847	103,761
Renting	41,946	37,474	26,731
Repairs and Maintenance	159,486	188,763	157,398
Taxes and Insurance	247,729	239,875	227,148
Total Expenses	1,084,178	1,080,320	1,062,504
Income Before Other Income	584,876	339,110	487,669
Other Income (loss)
Interest Expense	(440,676)	(349,303)	(289,041)
Total Other Income (Loss)	(440,676)	(349,303)	(289,041)
Net Income (Loss)	$ 144,200	$ (10,193)	$ 198,628
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)	$ 72,100	$ (5,097)	$ 99,314
Hamilton Essex Development
Revenues
Rental income	244,137	227,856	240,000
Total Revenues	244,137	227,856	240,000
Expenses
Administrative	9,280	26,065	1,740
Depreciation and amortization	8,706	2,830	2,830
Management Fees	8,632	9,114	9,600
Renting	37,353
Repairs and Maintenance	8,643	3,668	3,150
Taxes and Insurance	64,529	58,538	58,725
Total Expenses	137,143	100,215	76,045
Income Before Other Income	106,994	127,641	163,955
Other Income (loss)
Net Income (Loss)	$ 106,994	$ 127,641	$ 163,955
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)	$ 53,497	$ 63,821	$ 81,978
345 Franklin
Revenues
Rental income	1,567,718	1,473,098	1,471,455
Laundry and Sundry Income	5,410	5,380	4,707
Total Revenues	1,573,128	1,478,478	1,476,162
Expenses
Administrative	27,601	25,686	34,512
Depreciation and amortization	347,547	348,502	348,169
Management Fees	65,058	61,513	60,545
Operating	76,512	70,599	72,280
Renting	44,869	36,194	22,395
Repairs and Maintenance	130,926	109,039	66,606
Taxes and Insurance	147,217	138,503	130,867
Total Expenses	839,730	790,036	735,374
Income Before Other Income	733,398	688,442	740,788
Other Income (loss)
Interest Expense	(384,824)	(393,193)	(397,726)
Total Other Income (Loss)	(384,824)	(393,193)	(397,726)
Net Income (Loss)	$ 348,574	$ 295,249	$ 343,062
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)	$ 174,287	$ 147,625	$ 171,530
Hamilton 1025
Revenues
Rental income	112,785	352,888	798,710
Total Revenues	112,785	352,888	798,710
Expenses
Administrative	5,939	4,142	9,636
Depreciation and amortization		82,383	184,898
Management Fees	4,503	13,056	30,493
Operating	1,606	458	919
Renting	108	392	1,789
Repairs and Maintenance	94,680	227,346	296,423
Taxes and Insurance	46,164	99,646	161,984
Total Expenses	153,000	427,423	686,142
Income Before Other Income	(40,215)	(74,535)	112,568
Other Income (loss)
Interest Expense	(50)	(1,010)	(150,061)
Interest Income			10
Gain on Sale of Real Estate	1,972,926	2,379,763	1,324,174
Total Other Income (Loss)	1,972,876	2,378,753	1,174,123
Net Income (Loss)	$ 1,932,661	$ 2,304,219	$ 1,286,692
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)	$ 966,331	$ 1,152,109	$ 643,347
Hamilton Bay Sales
Revenues
Rental income		5,557	40,290
Total Revenues		5,557	40,290
Expenses
Administrative		6,326	6,295
Depreciation and amortization		81,655	4,921
Management Fees		253	1,745
Operating		38	315
Renting		181
Repairs and Maintenance		3,326	22,054
Taxes and Insurance		1,850	9,236
Total Expenses		93,629	44,566
Income Before Other Income		(88,072)	(4,276)
Other Income (loss)
Interest Expense		(2)	(71)
Gain on Sale of Real Estate		133,297	337,251
Total Other Income (Loss)		133,295	337,180
Net Income (Loss)		45,223	$ 332,904
Ownership interest (as a percent)			50.00%
Hamilton Bay Sales | NERA 50%
Other Income (loss)
Proportionate share of net income (loss)		22,612	$ 166,451
Hamilton Bay Apts
Revenues
Rental income	74,812	544,482	969,220
Total Revenues	74,812	544,482	969,220
Expenses
Administrative	12,566	8,617	10,768
Depreciation and amortization	30,000	181,152	298,503
Management Fees	3,091	19,947	38,258
Operating	1,435	4,239	2,358
Renting		241	4,354
Repairs and Maintenance	92,268	303,174	413,972
Taxes and Insurance	36,094	140,904	164,667
Total Expenses	175,454	658,274	932,880
Income Before Other Income	(100,642)	(113,792)	36,340
Other Income (loss)
Interest Expense	(101)	(41,957)	(261,440)
Gain on Sale of Real Estate	2,437,766	3,628,205
Total Other Income (Loss)	2,437,665	3,586,248	(261,440)
Net Income (Loss)	$ 2,337,023	$ 3,472,456	$ (225,100)
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)	$ 1,168,512	$ 1,736,228	$ (112,549)
Hamilton Minuteman
Revenues
Rental income	1,077,105	1,024,570	992,980
Laundry and Sundry Income	(364)	2,620	1,326
Total Revenues	1,076,741	1,027,190	994,306
Expenses
Administrative	5,449	5,671	6,557
Depreciation and amortization	355,463	349,910	341,645
Management Fees	42,852	39,976	40,648
Operating	93,795	87,284	96,690
Renting	5,940	7,992	6,202
Repairs and Maintenance	121,222	81,647	84,307
Taxes and Insurance	127,505	127,947	121,365
Total Expenses	752,226	700,427	697,414
Income Before Other Income	324,515	326,763	296,892
Other Income (loss)
Interest Expense	(237,707)	(237,293)	(286,628)
Total Other Income (Loss)	(237,707)	(237,293)	(286,628)
Net Income (Loss)	$ 86,808	$ 89,470	$ 10,263
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)	$ 43,404	$ 44,735	$ 5,132
Hamilton on Main Apts
Revenues
Rental income	3,419,218	3,359,971	3,236,490
Laundry and Sundry Income	38,080	37,968	40,720
Total Revenues	3,457,298	3,397,939	3,277,210
Expenses
Administrative	56,339	33,688	48,753
Depreciation and amortization	1,032,394	1,005,595	961,390
Management Fees	131,500	133,138	129,134
Operating	388,387	360,706	328,915
Renting	25,947	36,767	19,354
Repairs and Maintenance	663,314	606,570	558,988
Taxes and Insurance	426,665	436,266	476,185
Total Expenses	2,724,546	2,612,730	2,522,719
Income Before Other Income	732,752	785,209	754,491
Other Income (loss)
Interest Expense	(770,342)	(770,953)	(772,201)
Total Other Income (Loss)	(770,342)	(770,953)	(772,201)
Net Income (Loss)	$ (37,590)	$ 14,256	$ (17,710)
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)	$ (18,795)	$ 7,127	$ (8,855)
Dexter Park
Revenues
Rental income	15,769,019	14,983,834	14,731,240
Laundry and Sundry Income	106,237	101,131	108,711
Total Revenues	15,875,256	15,084,965	14,839,951
Expenses
Administrative	222,472	179,614	187,176
Depreciation and amortization	3,582,439	3,376,142	3,261,594
Management Fees	337,318	323,136	317,947
Operating	1,302,164	1,146,768	1,165,589
Renting	489,727	282,022	250,675
Repairs and Maintenance	1,395,609	1,435,579	1,391,171
Taxes and Insurance	1,731,155	1,719,536	1,541,959
Total Expenses	9,060,884	8,462,797	8,116,111
Income Before Other Income	6,814,372	6,622,168	6,723,840
Other Income (loss)
Interest Expense	(5,032,626)	(4,780,498)	(4,875,137)
Other Income (Expense)	(3,829,950)
Total Other Income (Loss)	(8,862,576)	(4,780,498)	(4,875,137)
Net Income (Loss)	$ (2,048,204)	$ 1,841,670	$ 1,848,705
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)	$ (819,282)	$ 736,668	$ 739,482