INVESTMENT IN UNCONSOLIDATED JOINT VENTURES (Income) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Oct. 28, 2009	Oct. 03, 2005	Mar. 02, 2005	Sep. 30, 2004	Aug. 31, 2004	Nov. 30, 2001
Revenues
Rental income	$ 6,182,514	$ 5,940,841	$ 18,352,687	$ 17,805,899
Laundry and Sundry Income	47,156	37,071	125,545	118,929
Total Revenues	6,229,670	5,977,912	18,478,232	17,924,828
Expenses
Administrative	103,091	85,719	283,328	295,039
Depreciation and amortization	1,481,176	1,471,671	4,418,840	4,356,153
Management Fees	165,904	163,207	492,893	492,819
Operating	377,486	390,016	1,298,588	1,425,352
Renting	290,542	281,958	401,664	427,092
Repairs and Maintenance	807,600	888,681	1,919,743	2,173,269
Taxes and Insurance	764,021	718,610	2,321,323	2,110,774
Total Expenses	3,989,820	3,999,862	11,136,379	11,280,498
Income Before Other Income	2,239,850	1,978,050	7,341,853	6,644,330
Other Income (loss)
Interest Expense	(1,730,605)	(1,738,634)	(5,197,591)	(5,125,243)
Other Income (Expense)				(3,829,950)
Gain on Sale of Real Estate		856,704	738,983	3,913,427
Total Other Income (Loss)	(1,730,605)	(881,930)	(4,458,608)	(5,041,766)
Net Income (Loss)	509,245	1,096,120	2,883,245	1,602,564
Proportionate share of net income (loss)	224,993	534,431	1,287,339	1,073,692
NERA 50%
Other Income (loss)
Proportionate share of net income (loss)	$ 106,504	$ 479,907	$ 670,223	$ 2,163,322
Ownership interest (as a percent)	50.00%	50.00%	50.00%	50.00%
NERA 40%
Other Income (loss)
Proportionate share of net income (loss)	$ 118,489	$ 54,524	$ 617,116	$ (1,089,630)
Ownership interest (as a percent)	40.00%	40.00%	40.00%	40.00%
Hamilton Essex 81
Revenues
Rental income	$ 429,472	$ 403,744	$ 1,339,583	$ 1,221,779
Laundry and Sundry Income	3,810	3,186	10,680	10,570
Total Revenues	433,282	406,930	1,350,263	1,232,349
Expenses
Administrative	7,713	4,541	22,968	17,850
Depreciation and amortization	120,986	120,236	360,417	354,218
Management Fees	17,228	16,743	51,454	45,452
Operating	16,773	17,701	53,817	57,734
Renting	23,575	14,563	32,092	25,613
Repairs and Maintenance	37,324	35,741	101,995	121,920
Taxes and Insurance	60,904	61,829	184,210	187,018
Total Expenses	284,503	271,354	806,953	809,805
Income Before Other Income	148,779	135,576	543,310	422,544
Other Income (loss)
Interest Expense	(117,103)	(113,864)	(360,122)	(321,785)
Total Other Income (Loss)	(117,103)	(113,864)	(360,122)	(321,785)
Net Income (Loss)	31,676	$ 21,712	183,188	$ 100,759
Ownership interest (as a percent)		50.00%		50.00%
Hamilton Essex 81 | NERA 50%
Other Income (loss)
Proportionate share of net income (loss)	$ 15,837	$ 10,857	$ 91,593	$ 50,380
Ownership interest (as a percent)	50.00%		50.00%
Hamilton Essex Development
Revenues
Rental income	$ 60,471	60,752	$ 161,712	168,608
Total Revenues	60,471	60,752	161,712	168,608
Expenses
Administrative	11,488	437	21,162	6,452
Depreciation and amortization	5,074	3,689	15,223	5,018
Management Fees	2,174	2,158	6,494	6,472
Operating			8
Repairs and Maintenance		586	3,180	7,928
Taxes and Insurance	15,316	15,417	46,176	48,614
Total Expenses	34,052	22,287	92,243	74,484
Income Before Other Income	26,419	38,465	69,469	94,124
Other Income (loss)
Net Income (Loss)	26,419	$ 38,465	69,469	$ 94,124
Ownership interest (as a percent)		50.00%		50.00%
Hamilton Essex Development | NERA 50%
Other Income (loss)
Proportionate share of net income (loss)	$ 13,209	$ 19,234	$ 34,734	$ 47,062
Ownership interest (as a percent)	50.00%		50.00%
345 Franklin
Revenues
Rental income	$ 404,000	379,821	$ 1,207,094	1,171,913
Laundry and Sundry Income	1,806	786	2,390	3,547
Total Revenues	405,806	380,607	1,209,484	1,175,460
Expenses
Administrative	7,324	9,388	17,366	22,582
Depreciation and amortization	86,269	87,166	258,722	259,925
Management Fees	16,063	15,618	46,506	48,417
Operating	13,766	17,704	54,291	54,623
Renting	9,217	36,118	21,210	41,335
Repairs and Maintenance	44,687	60,855	86,964	107,766
Taxes and Insurance	35,630	35,747	111,239	107,916
Total Expenses	212,956	262,596	596,298	642,564
Income Before Other Income	192,850	118,011	613,186	532,896
Other Income (loss)
Interest Expense	(94,449)	(95,873)	(283,531)	(289,348)
Total Other Income (Loss)	(94,449)	(95,873)	(283,531)	(289,348)
Net Income (Loss)	98,401	$ 22,138	329,655	$ 243,548
Ownership interest (as a percent)		50.00%		50.00%						50.00%
345 Franklin | NERA 50%
Other Income (loss)
Proportionate share of net income (loss)	$ 49,200	$ 11,069	$ 164,827	$ 121,775
Ownership interest (as a percent)	50.00%		50.00%
Hamilton 1025
Revenues
Rental income	$ 25,497	21,357	$ 72,558	91,719
Total Revenues	25,497	21,357	72,558	91,719
Expenses
Administrative	1,432	2,036	5,834	4,606
Depreciation and amortization	3,190		9,580
Management Fees	887	948	2,786	3,562
Operating	62	397	925	584
Renting	64		64	108
Repairs and Maintenance		22,888	28,399	91,461
Taxes and Insurance	3,957	8,301	18,402	39,169
Total Expenses	9,592	34,570	65,990	139,490
Income Before Other Income	15,905	(13,213)	6,568	(47,771)
Other Income (loss)
Interest Expense		(2)		(49)
Gain on Sale of Real Estate		409,521	306,075	1,714,935
Total Other Income (Loss)		409,519	306,075	1,714,886
Net Income (Loss)	15,905	$ 396,306	312,643	$ 1,667,115
Ownership interest (as a percent)		50.00%		50.00%			50.00%
Hamilton 1025 | NERA 50%
Other Income (loss)
Proportionate share of net income (loss)	$ 7,952	$ 198,153	$ 156,321	$ 833,558
Ownership interest (as a percent)	50.00%		50.00%
Hamilton Bay Apts
Revenues
Rental income	$ (88)	18,525	$ 3,541	63,968
Total Revenues	(88)	18,525	3,541	63,968
Expenses
Administrative	1,291	2,128	5,576	10,553
Depreciation and amortization		6,000	5,420	28,000
Management Fees		522	145	2,443
Operating	64	187	(8)	1,377
Repairs and Maintenance		16,987	10,266	74,821
Taxes and Insurance		5,703	5,206	31,275
Total Expenses	1,355	31,527	26,605	148,469
Income Before Other Income	(1,443)	(13,002)	(23,064)	(84,501)
Other Income (loss)
Interest Expense		(20)	(6)	(95)
Gain on Sale of Real Estate		447,183	432,908	2,198,492
Total Other Income (Loss)		447,163	432,902	2,198,397
Net Income (Loss)	(1,443)	$ 434,161	409,838	$ 2,113,896
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)	$ (723)	$ 217,081	$ 204,918	$ 1,056,949
Ownership interest (as a percent)	50.00%		50.00%
Hamilton Minuteman
Revenues
Rental income	$ 294,454	275,672	$ 850,523	804,611
Laundry and Sundry Income	425	39	2,560	(364)
Total Revenues	294,879	275,711	853,083	804,247
Expenses
Administrative	1,533	1,125	7,283	5,505
Depreciation and amortization	90,045	89,430	267,546	265,272
Management Fees	11,695	11,052	33,995	31,914
Operating	19,116	19,000	70,695	79,375
Renting	100	1,173	2,674	5,481
Repairs and Maintenance	22,406	38,478	104,727	83,902
Taxes and Insurance	33,620	32,100	98,389	94,751
Total Expenses	178,515	192,358	585,309	566,200
Income Before Other Income	116,364	83,353	267,774	238,047
Other Income (loss)
Interest Expense	(59,451)	(59,507)	(176,056)	(176,916)
Total Other Income (Loss)	(59,451)	(59,507)	(176,056)	(176,916)
Net Income (Loss)	56,913	$ 23,846	91,718	$ 61,131
Ownership interest (as a percent)		50.00%		50.00%				50.00%
Hamilton Minuteman | NERA 50%
Other Income (loss)
Proportionate share of net income (loss)	$ 28,456	$ 11,923	$ 45,859	$ 30,566
Ownership interest (as a percent)	50.00%		50.00%
Hamilton on Main Apts
Revenues
Rental income	$ 865,299	847,723	$ 2,553,301	2,589,262
Laundry and Sundry Income	10,437	9,583	30,517	28,614
Total Revenues	875,736	857,306	2,583,818	2,617,876
Expenses
Administrative	16,108	10,789	51,020	37,978
Depreciation and amortization	262,294	258,280	781,400	771,230
Management Fees	33,378	33,222	98,381	99,274
Operating	92,863	58,789	284,679	262,071
Renting	6,043	6,054	39,532	20,563
Repairs and Maintenance	178,777	164,150	495,863	490,189
Taxes and Insurance	106,568	109,202	313,906	317,227
Total Expenses	696,031	640,486	2,064,781	1,998,532
Income Before Other Income	179,705	216,820	519,037	619,344
Other Income (loss)
Interest Expense	(194,554)	(193,638)	(575,093)	(573,278)
Total Other Income (Loss)	(194,554)	(193,638)	(575,093)	(573,278)
Net Income (Loss)	(14,849)	$ 23,182	(56,056)	$ 46,066
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)	$ (7,426)	$ 11,591	$ (28,028)	$ 23,033
Ownership interest (as a percent)	50.00%		50.00%
Dexter Park
Revenues
Rental income	$ 4,103,409	3,933,247	$ 12,164,375	11,694,039
Laundry and Sundry Income	30,678	23,477	79,398	76,562
Total Revenues	4,134,087	3,956,724	12,243,773	11,770,601
Expenses
Administrative	56,202	55,275	152,119	189,513
Depreciation and amortization	913,318	906,870	2,720,532	2,672,490
Management Fees	84,479	82,944	253,132	255,285
Operating	234,842	276,238	834,181	969,588
Renting	251,543	224,050	306,092	333,992
Repairs and Maintenance	524,406	548,996	1,088,349	1,195,282
Taxes and Insurance	508,026	450,311	1,543,795	1,284,804
Total Expenses	2,572,816	2,544,684	6,898,200	6,900,954
Income Before Other Income	1,561,271	1,412,040	5,345,573	4,869,647
Other Income (loss)
Interest Expense	(1,265,048)	(1,275,730)	(3,802,783)	(3,763,772)
Other Income (Expense)				(3,829,950)
Total Other Income (Loss)	(1,265,048)	(1,275,730)	(3,802,783)	(7,593,722)
Net Income (Loss)	296,223	$ 136,309	1,542,790	$ (2,724,075)
Ownership interest (as a percent)		40.00%		40.00%	40.00%
Dexter Park | NERA 40%
Other Income (loss)
Proportionate share of net income (loss)	$ 118,489	$ 54,524	$ 617,116	$ (1,089,630)
Ownership interest (as a percent)	40.00%		40.00%