INVESTMENT IN UNCONSOLIDATED JOINT VENTURES (Income) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Oct. 28, 2009	Oct. 03, 2005	Mar. 02, 2005	Sep. 30, 2004	Aug. 31, 2004	Nov. 30, 2001
Revenues
Rental income	$ 23,376,262	$ 24,015,295	$ 23,526,780
Laundry and Sundry Income	162,523	170,727	151,950
Total Revenues	23,538,785	24,186,022	23,678,730
Expenses
Administrative	316,569	336,837	368,608
Depreciation and amortization	5,884,897	5,856,136	5,871,516
Management Fees	660,006	692,250	678,263
Operating	1,740,939	1,770,827	1,947,228
Renting	401,263	331,500	171,267
Repairs and Maintenance	2,959,112	2,994,069	2,546,726
Taxes and Insurance	2,963,065	2,892,136	2,750,187
Total Expenses	14,925,851	14,873,755	14,333,795
Income Before Other Income	8,612,934	9,312,267	9,344,935
Other Income (loss)
Interest Expense	(6,574,209)	(7,032,305)	(7,440,510)
Interest Income	0	10	14
Other Income (Expense)			96
Gain on Sale of Real Estate	6,141,265	1,661,425	169,093
Total Other Income (Loss)	(432,944)	(5,370,870)	(7,271,307)
Net Income (Loss)	8,179,990	3,941,397	2,073,625
Proportionate share of net income (loss)	3,905,827	1,785,827	868,574
NERA 50%
Other Income (loss)
Proportionate share of net income (loss)	3,169,159	1,046,345	195,617
NERA 40%
Other Income (loss)
Proportionate share of net income (loss)	736,668	739,482	672,958
Hamilton Essex 81
Revenues
Rental income	1,404,006	1,534,910	1,464,871
Laundry and Sundry Income	15,424	15,263	13,319
Total Revenues	1,419,430	1,550,173	1,478,190
Expenses
Administrative	26,760	31,400	28,849
Depreciation and amortization	456,728	452,186	439,046
Management Fees	59,873	63,880	63,226
Operating	70,847	103,761	102,872
Renting	37,474	26,731	11,246
Repairs and Maintenance	188,763	157,398	153,329
Taxes and Insurance	239,875	227,148	216,602
Total Expenses	1,080,320	1,062,504	1,015,170
Income Before Other Income	339,110	487,669	463,020
Other Income (loss)
Interest Expense	(349,303)	(289,041)	(432,732)
Interest Income	0
Gain on Sale of Real Estate	0
Total Other Income (Loss)	(349,303)	(289,041)	(432,732)
Net Income (Loss)	(10,193)	$ 198,628	$ 30,288
Proportionate share of net income (loss)	0
Ownership interest (as a percent)		50.00%	50.00%
Hamilton Essex 81 | NERA 50%
Other Income (loss)
Proportionate share of net income (loss)	$ (5,097)	$ 99,314	$ 15,144
Ownership interest (as a percent)	50.00%
Hamilton Essex 81 | NERA 40%
Other Income (loss)
Proportionate share of net income (loss)	$ 0
Hamilton Essex Development
Revenues
Rental income	227,856	240,000	277,568
Laundry and Sundry Income	0
Total Revenues	227,856	240,000	277,568
Expenses
Administrative	26,065	1,740	2,000
Depreciation and amortization	2,830	2,830	2,829
Management Fees	9,114	9,600	11,114
Operating	0
Renting	0
Repairs and Maintenance	3,668	3,150	200
Taxes and Insurance	58,538	58,725	52,846
Total Expenses	100,215	76,045	68,989
Income Before Other Income	127,641	163,955	208,579
Other Income (loss)
Interest Expense	0		(46,283)
Interest Income	0
Gain on Sale of Real Estate	0
Total Other Income (Loss)	0		(46,283)
Net Income (Loss)	127,641	$ 163,955	$ 162,296
Proportionate share of net income (loss)	0
Ownership interest (as a percent)		50.00%	50.00%
Hamilton Essex Development | NERA 50%
Other Income (loss)
Proportionate share of net income (loss)	$ 63,821	$ 81,978	$ 81,148
Ownership interest (as a percent)	50.00%
Hamilton Essex Development | NERA 40%
Other Income (loss)
Proportionate share of net income (loss)	$ 0
345 Franklin
Revenues
Rental income	1,473,098	1,471,455	1,396,428
Laundry and Sundry Income	5,380	4,707	656
Total Revenues	1,478,478	1,476,162	1,397,084
Expenses
Administrative	25,686	34,512	35,071
Depreciation and amortization	348,502	348,169	368,775
Management Fees	61,513	60,545	57,604
Operating	70,599	72,280	80,873
Renting	36,194	22,395	15,815
Repairs and Maintenance	109,039	66,606	61,183
Taxes and Insurance	138,503	130,867	124,266
Total Expenses	790,036	735,374	743,587
Income Before Other Income	688,442	740,788	653,497
Other Income (loss)
Interest Expense	(393,193)	(397,726)	(398,414)
Interest Income	0
Gain on Sale of Real Estate	0
Total Other Income (Loss)	(393,193)	(397,726)	(398,414)
Net Income (Loss)	295,249	$ 343,062	$ 255,083
Proportionate share of net income (loss)	0
Ownership interest (as a percent)		50.00%	50.00%						50.00%
345 Franklin | NERA 50%
Other Income (loss)
Proportionate share of net income (loss)	$ 147,625	$ 171,530	$ 127,543
Ownership interest (as a percent)	50.00%
345 Franklin | NERA 40%
Other Income (loss)
Proportionate share of net income (loss)	$ 0
Hamilton 1025
Revenues
Rental income	352,888	798,710	962,511
Laundry and Sundry Income	0
Total Revenues	352,888	798,710	962,511
Expenses
Administrative	4,142	9,636	6,262
Depreciation and amortization	82,383	184,898	236,513
Management Fees	13,056	30,493	37,736
Operating	458	919	1,050
Renting	392	1,789	270
Repairs and Maintenance	227,346	296,423	314,409
Taxes and Insurance	99,646	161,984	166,842
Total Expenses	427,423	686,142	763,082
Income Before Other Income	(74,535)	112,568	199,429
Other Income (loss)
Interest Expense	(1,010)	(150,061)	(281,093)
Interest Income	0	10	14
Gain on Sale of Real Estate	2,379,763	1,324,174
Total Other Income (Loss)	2,378,753	1,174,123	(281,079)
Net Income (Loss)	2,304,218	$ 1,286,692	$ (81,651)
Proportionate share of net income (loss)	0
Ownership interest (as a percent)		50.00%	50.00%			50.00%
Hamilton 1025 | NERA 50%
Other Income (loss)
Proportionate share of net income (loss)	$ 1,152,109	$ 643,346	$ (40,826)
Ownership interest (as a percent)	50.00%
Hamilton 1025 | NERA 40%
Other Income (loss)
Proportionate share of net income (loss)	$ 0
Hamilton Bay Sales
Revenues
Rental income	5,557	40,290	99,413
Laundry and Sundry Income	0
Total Revenues	5,557	40,290	99,413
Expenses
Administrative	6,326	6,295	8,105
Depreciation and amortization	81,655	4,921	25,418
Management Fees	253	1,745	3,987
Operating	38	315	911
Renting	181
Repairs and Maintenance	3,326	22,054	43,559
Taxes and Insurance	1,850	9,236	20,461
Total Expenses	93,629	44,566	102,441
Income Before Other Income	(88,072)	(4,276)	(3,028)
Other Income (loss)
Interest Expense	(2)	(71)	(322)
Interest Income	0
Gain on Sale of Real Estate	133,297	337,251	169,093
Total Other Income (Loss)	133,295	337,180	168,771
Net Income (Loss)	45,223	$ 332,904	$ 165,743
Proportionate share of net income (loss)	0
Ownership interest (as a percent)		50.00%	50.00%
Hamilton Bay Sales | NERA 50%
Other Income (loss)
Proportionate share of net income (loss)	$ 22,612	$ 166,451	$ 82,872
Ownership interest (as a percent)	50.00%
Hamilton Bay Sales | NERA 40%
Other Income (loss)
Proportionate share of net income (loss)	$ 0
Hamilton Bay Apts
Revenues
Rental income	544,482	969,220	973,559
Laundry and Sundry Income	0
Total Revenues	544,482	969,220	973,559
Expenses
Administrative	8,617	10,768	8,592
Depreciation and amortization	181,152	298,503	295,176
Management Fees	19,947	38,258	38,640
Operating	4,239	2,358	1,173
Renting	241	4,354	2,986
Repairs and Maintenance	303,174	413,972	362,861
Taxes and Insurance	140,904	164,667	154,348
Total Expenses	658,274	932,880	863,776
Income Before Other Income	(113,792)	36,340	109,783
Other Income (loss)
Interest Expense	(41,957)	(261,440)	(265,636)
Interest Income	0
Gain on Sale of Real Estate	3,628,205
Total Other Income (Loss)	3,586,248	(261,440)	(265,636)
Net Income (Loss)	3,472,456	$ (225,100)	$ (155,854)
Proportionate share of net income (loss)	0
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)	$ 1,736,228	$ (112,550)	$ (77,927)
Ownership interest (as a percent)	50.00%
Hamilton Bay Apts | NERA 40%
Other Income (loss)
Proportionate share of net income (loss)	$ 0
Hamilton Minuteman
Revenues
Rental income	1,024,570	992,980	942,539
Laundry and Sundry Income	2,620	1,326
Total Revenues	1,027,190	994,306	942,539
Expenses
Administrative	5,671	6,557	5,402
Depreciation and amortization	349,910	341,645	329,150
Management Fees	39,976	40,648	38,683
Operating	87,284	96,690	93,492
Renting	7,992	6,202	8,807
Repairs and Maintenance	81,647	84,307	82,769
Taxes and Insurance	127,947	121,365	124,393
Total Expenses	700,427	697,414	682,696
Income Before Other Income	326,763	296,892	259,843
Other Income (loss)
Interest Expense	(237,293)	(286,628)	(308,725)
Interest Income	0
Gain on Sale of Real Estate	0
Total Other Income (Loss)	(237,293)	(286,628)	(308,725)
Net Income (Loss)	89,470	$ 10,263	$ (48,883)
Proportionate share of net income (loss)	0
Ownership interest (as a percent)		50.00%	50.00%				50.00%
Hamilton Minuteman | NERA 50%
Other Income (loss)
Proportionate share of net income (loss)	$ 44,735	$ 5,132	$ (24,442)
Ownership interest (as a percent)	50.00%
Hamilton Minuteman | NERA 40%
Other Income (loss)
Proportionate share of net income (loss)	$ 0
Hamilton on Main Apts
Revenues
Rental income	3,359,971	3,236,490	3,093,045
Laundry and Sundry Income	37,968	40,720	44,911
Total Revenues	3,397,939	3,277,210	3,137,956
Expenses
Administrative	33,688	48,753	48,818
Depreciation and amortization	1,005,595	961,390	955,269
Management Fees	133,138	129,134	122,405
Operating	360,706	328,915	432,352
Renting	36,767	19,354	9,765
Repairs and Maintenance	606,570	558,988	393,665
Taxes and Insurance	436,266	476,185	341,990
Total Expenses	2,612,730	2,522,719	2,304,264
Income Before Other Income	785,209	754,491	833,692
Other Income (loss)
Interest Expense	(770,953)	(772,201)	(769,579)
Interest Income	0
Other Income (Expense)			96
Gain on Sale of Real Estate	0
Total Other Income (Loss)	(770,953)	(772,201)	(769,483)
Net Income (Loss)	14,256	$ (17,710)	$ 64,209
Proportionate share of net income (loss)	0
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)	$ 7,127	$ (8,855)	$ 32,105
Ownership interest (as a percent)	50.00%
Hamilton on Main Apts | NERA 40%
Other Income (loss)
Proportionate share of net income (loss)	$ 0
Dexter Park
Revenues
Rental income	14,983,834	14,731,240	14,316,846
Laundry and Sundry Income	101,131	108,711	93,064
Total Revenues	15,084,965	14,839,951	14,409,910
Expenses
Administrative	179,614	187,176	225,509
Depreciation and amortization	3,376,142	3,261,594	3,219,340
Management Fees	323,136	317,947	304,868
Operating	1,146,768	1,165,589	1,234,505
Renting	282,022	250,675	122,378
Repairs and Maintenance	1,435,579	1,391,171	1,134,751
Taxes and Insurance	1,719,536	1,541,959	1,548,439
Total Expenses	8,462,797	8,116,111	7,789,790
Income Before Other Income	6,622,168	6,723,840	6,620,120
Other Income (loss)
Interest Expense	(4,780,498)	(4,875,137)	(4,937,726)
Interest Income	0
Gain on Sale of Real Estate	0
Total Other Income (Loss)	(4,780,498)	(4,875,137)	(4,937,726)
Net Income (Loss)	1,841,670	$ 1,848,705	$ 1,682,394
Proportionate share of net income (loss)	0
Ownership interest (as a percent)		40.00%	40.00%	40.00%
Dexter Park | NERA 50%
Other Income (loss)
Proportionate share of net income (loss)	0
Dexter Park | NERA 40%
Other Income (loss)
Proportionate share of net income (loss)	$ 736,668	$ 739,482	$ 672,958
Ownership interest (as a percent)	40.00%