INVESTMENT IN UNCONSOLIDATED JOINT VENTURES (Income) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Oct. 28, 2009	Oct. 03, 2005	Mar. 02, 2005	Sep. 30, 2004	Aug. 31, 2004	Nov. 30, 2001
Revenues
Rental income	$ 5,940,841	$ 5,738,326	$ 17,805,899	$ 17,667,215
Laundry and Sundry Income	37,071	36,155	118,929	114,458
Total Revenues	5,977,912	5,774,481	17,924,828	17,781,673
Expenses
Administrative	85,719	78,977	295,039	228,243
Depreciation and amortization	1,471,671	1,560,489	4,356,153	4,550,497
Management Fees	163,207	148,298	492,819	500,439
Operating	390,016	383,153	1,425,352	1,313,650
Renting	281,958	118,612	427,092	217,329
Repairs and Maintenance	888,681	945,909	2,173,269	2,319,272
Taxes and Insurance	718,610	733,656	2,110,774	2,236,868
Total Expenses	3,999,862	3,969,094	11,280,498	11,366,298
Income Before Other Income	1,978,050	1,805,387	6,644,330	6,415,375
Other Income (loss)
Interest Expense	(1,738,634)	(1,645,737)	(5,125,243)	(4,933,332)
Other Income (Expense)			(3,829,950)
Gain on Sale of Real Estate	856,704	1,865,705	3,913,427	4,236,349
Total Other Income (Loss)	(881,930)	219,968	(5,041,766)	(696,983)
Net Income (Loss)	1,096,120	2,025,355	1,602,564	5,718,392
Proportionate share of net income (loss)	534,429	990,167	1,073,692	2,721,229
NERA 50%
Other Income (loss)
Proportionate share of net income (loss)	479,905	900,130	2,163,322	2,169,361
NERA 40%
Other Income (loss)
Proportionate share of net income (loss)	54,524	90,037	(1,089,630)	551,868
Hamilton Essex 81
Revenues
Rental income	403,744	397,458	1,221,779	1,120,743
Laundry and Sundry Income	3,186	2,825	10,570	10,415
Total Revenues	406,930	400,283	1,232,349	1,131,158
Expenses
Administrative	4,541	10,470	17,850	20,400
Depreciation and amortization	120,236	114,334	354,218	341,332
Management Fees	16,743	15,011	45,452	46,989
Operating	17,701	15,471	57,734	55,178
Renting	14,563	17,102	25,613	26,618
Repairs and Maintenance	35,741	87,270	121,920	136,821
Taxes and Insurance	61,829	59,780	187,018	180,881
Total Expenses	271,354	319,438	809,805	808,219
Income Before Other Income	135,576	80,845	422,544	322,939
Other Income (loss)
Interest Expense	(113,864)	(91,838)	(321,785)	(256,232)
Total Other Income (Loss)	(113,864)	(91,838)	(321,785)	(256,232)
Net Income (Loss)	21,712	$ (10,993)	100,759	$ 66,707
Ownership interest (as a percent)		50.00%		50.00%
Hamilton Essex 81 | NERA 50%
Other Income (loss)
Proportionate share of net income (loss)	$ 10,856	$ (5,497)	$ 50,380	$ 33,354
Ownership interest (as a percent)	50.00%		50.00%
Hamilton Essex Development
Revenues
Rental income	$ 60,752	53,928	$ 168,608	173,928
Total Revenues	60,752	53,928	168,608	173,928
Expenses
Administrative	437	425	6,452	1,275
Depreciation and amortization	3,689	707	5,018	2,122
Management Fees	2,158	2,157	6,472	6,957
Repairs and Maintenance	586		7,928	3,180
Taxes and Insurance	15,417	14,979	48,614	44,059
Total Expenses	22,287	18,268	74,484	57,593
Income Before Other Income	38,465	35,660	94,124	116,335
Other Income (loss)
Net Income (Loss)	38,465	$ 35,660	94,124	$ 116,335
Ownership interest (as a percent)		50.00%		50.00%
Hamilton Essex Development | NERA 50%
Other Income (loss)
Proportionate share of net income (loss)	$ 19,233	$ 17,830	$ 47,062	$ 58,168
Ownership interest (as a percent)	50.00%		50.00%
345 Franklin
Revenues
Rental income	$ 379,821	368,508	$ 1,171,913	1,095,674
Laundry and Sundry Income	786	1,723	3,547	3,860
Total Revenues	380,607	370,231	1,175,460	1,099,534
Expenses
Administrative	9,388	7,262	22,582	21,302
Depreciation and amortization	87,166	87,406	259,925	260,841
Management Fees	15,618	16,322	48,417	45,786
Operating	17,704	14,768	54,623	51,188
Renting	36,118	16,918	41,335	29,166
Repairs and Maintenance	60,855	38,542	107,766	89,973
Taxes and Insurance	35,747	31,003	107,916	97,973
Total Expenses	262,596	212,221	642,564	596,229
Income Before Other Income	118,011	158,010	532,896	503,305
Other Income (loss)
Interest Expense	(95,873)	(97,877)	(289,348)	(295,670)
Total Other Income (Loss)	(95,873)	(97,877)	(289,348)	(295,670)
Net Income (Loss)	22,138	$ 60,133	243,548	$ 207,635
Ownership interest (as a percent)		50.00%		50.00%						50.00%
345 Franklin | NERA 50%
Other Income (loss)
Proportionate share of net income (loss)	$ 11,069	$ 30,066	$ 121,775	$ 103,818
Ownership interest (as a percent)	50.00%		50.00%
Hamilton 1025
Revenues
Rental income	$ 21,357	71,380	$ 91,719	308,579
Total Revenues	21,357	71,380	91,719	308,579
Expenses
Administrative	2,036	967	4,606	3,150
Depreciation and amortization		45,626		136,877
Management Fees	948	2,281	3,562	11,084
Operating	397	205	584	305
Renting		60	108	392
Repairs and Maintenance	22,888	62,270	91,461	177,987
Taxes and Insurance	8,301	23,473	39,169	80,038
Total Expenses	34,570	134,882	139,490	409,833
Income Before Other Income	(13,213)	(63,502)	(47,771)	(101,254)
Other Income (loss)
Interest Expense	(2)	(190)	(49)	(967)
Gain on Sale of Real Estate	409,521	848,484	1,714,935	1,787,816
Total Other Income (Loss)	409,519	848,294	1,714,886	1,786,849
Net Income (Loss)	396,306	$ 784,792	1,667,115	$ 1,685,595
Ownership interest (as a percent)		50.00%		50.00%			50.00%
Hamilton 1025 | NERA 50%
Other Income (loss)
Proportionate share of net income (loss)	$ 198,153	$ 392,396	$ 833,558	$ 842,798
Ownership interest (as a percent)	50.00%		50.00%
Hamilton Bay Sales
Revenues
Rental income		1,540		6,822
Total Revenues		1,540		6,822
Expenses
Administrative		1,558		3,706
Depreciation and amortization		80,190		41,750
Management Fees		37		245
Operating				38
Renting				181
Repairs and Maintenance		226		3,326
Taxes and Insurance		637		1,850
Total Expenses		82,648		51,096
Income Before Other Income		(81,108)		(44,274)
Other Income (loss)
Interest Expense				(2)
Gain on Sale of Real Estate				93,392
Total Other Income (Loss)				93,390
Net Income (Loss)		$ (81,108)		$ 49,116
Ownership interest (as a percent)		50.00%		50.00%
Hamilton Bay Sales | NERA 50%
Other Income (loss)
Proportionate share of net income (loss)		$ (40,554)		$ 24,558
Hamilton Bay Apts
Revenues
Rental income	$ 18,525	101,378	$ 63,968	499,341
Total Revenues	18,525	101,378	63,968	499,341
Expenses
Administrative	2,128	1,945	10,553	7,142
Depreciation and amortization	6,000	41,157	28,000	243,755
Management Fees	522	3,463	2,443	18,332
Operating	187	915	1,377	2,289
Renting		60		241
Repairs and Maintenance	16,987	60,661	74,821	253,489
Taxes and Insurance	5,703	30,239	31,275	117,587
Total Expenses	31,527	138,440	148,469	642,835
Income Before Other Income	(13,002)	(37,062)	(84,501)	(143,494)
Other Income (loss)
Interest Expense	(20)	(135)	(95)	(41,876)
Gain on Sale of Real Estate	447,183	1,017,221	2,198,492	2,355,141
Total Other Income (Loss)	447,163	1,017,086	2,198,397	2,313,265
Net Income (Loss)	434,161	$ 980,024	2,113,896	$ 2,169,771
Ownership interest (as a percent)		50.00%		50.00%		50.00%
Hamilton Bay Apts | NERA 50%
Other Income (loss)
Proportionate share of net income (loss)	$ 217,080	$ 490,011	$ 1,056,949	$ 1,084,886
Ownership interest (as a percent)	50.00%		50.00%
Hamilton Minuteman
Revenues
Rental income	$ 275,672	258,529	$ 804,611	775,327
Laundry and Sundry Income	39	675	(364)	1,945
Total Revenues	275,711	259,204	804,247	777,272
Expenses
Administrative	1,125	1,460	5,505	3,871
Depreciation and amortization	89,430	87,709	265,272	261,519
Management Fees	11,052	9,858	31,914	30,327
Operating	19,000	23,816	79,375	75,819
Renting	1,173	941	5,481	5,044
Repairs and Maintenance	38,478	20,636	83,902	59,922
Taxes and Insurance	32,100	32,843	94,751	95,737
Total Expenses	192,358	177,263	566,200	532,239
Income Before Other Income	83,353	81,941	238,047	245,033
Other Income (loss)
Interest Expense	(59,507)	(59,802)	(176,916)	(177,821)
Total Other Income (Loss)	(59,507)	(59,802)	(176,916)	(177,821)
Net Income (Loss)	23,846	$ 22,139	61,131	$ 67,212
Ownership interest (as a percent)		50.00%		50.00%				50.00%
Hamilton Minuteman | NERA 50%
Other Income (loss)
Proportionate share of net income (loss)	$ 11,923	$ 11,070	$ 30,566	$ 33,606
Ownership interest (as a percent)	50.00%		50.00%
Hamilton on Main Apts
Revenues
Rental income	$ 847,723	844,532	$ 2,589,262	2,499,765
Laundry and Sundry Income	9,583	10,069	28,614	28,437
Total Revenues	857,306	854,601	2,617,876	2,528,202
Expenses
Administrative	10,789	8,683	37,978	25,920
Depreciation and amortization	258,280	256,859	771,230	747,077
Management Fees	33,222	33,685	99,274	99,767
Operating	58,789	73,397	262,071	256,589
Renting	6,054	9,764	20,563	31,162
Repairs and Maintenance	164,150	159,062	490,189	486,489
Taxes and Insurance	109,202	109,391	317,227	327,807
Total Expenses	640,486	650,841	1,998,532	1,974,811
Income Before Other Income	216,820	203,760	619,344	553,391
Other Income (loss)
Interest Expense	(193,638)	(194,143)	(573,278)	(577,041)
Total Other Income (Loss)	(193,638)	(194,143)	(573,278)	(577,041)
Net Income (Loss)	23,182	$ 9,617	46,066	$ (23,650)
Ownership interest (as a percent)		50.00%		50.00%					50.00%
Hamilton on Main Apts | NERA 50%
Other Income (loss)
Proportionate share of net income (loss)	$ 11,591	$ 4,809	$ 23,033	$ (11,825)
Ownership interest (as a percent)	50.00%		50.00%
Dexter Park
Revenues
Rental income	$ 3,933,247	3,641,073	$ 11,694,039	11,187,036
Laundry and Sundry Income	23,477	20,863	76,562	69,801
Total Revenues	3,956,724	3,661,936	11,770,601	11,256,837
Expenses
Administrative	55,275	46,207	189,513	141,477
Depreciation and amortization	906,870	846,501	2,672,490	2,515,224
Management Fees	82,944	65,484	255,285	240,952
Operating	276,238	254,581	969,588	872,244
Renting	224,050	73,767	333,992	124,525
Repairs and Maintenance	548,996	517,242	1,195,282	1,108,085
Taxes and Insurance	450,311	431,311	1,284,804	1,290,936
Total Expenses	2,544,684	2,235,093	6,900,954	6,293,443
Income Before Other Income	1,412,040	1,426,843	4,869,647	4,963,394
Other Income (loss)
Interest Expense	(1,275,730)	(1,201,752)	(3,763,772)	(3,583,723)
Other Income (Expense)			(3,829,950)
Total Other Income (Loss)	(1,275,730)	(1,201,752)	(7,593,722)	(3,583,723)
Net Income (Loss)	136,309	$ 225,091	(2,724,075)	$ 1,379,671
Ownership interest (as a percent)		40.00%		40.00%	40.00%
Dexter Park | NERA 40%
Other Income (loss)
Proportionate share of net income (loss)	$ 54,524	$ 90,037	$ (1,089,630)	$ 551,868
Ownership interest (as a percent)	40.00%		40.00%