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INVESTMENT IN UNCONSOLIDATED JOINT VENTURES (Income) (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Oct. 28, 2009 | Oct. 03, 2005 | Mar. 02, 2005 | Sep. 30, 2004 | Aug. 31, 2004 | Nov. 30, 2001
Investment Properties |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |
Rental income | $ 6,025,406 | $ 5,849,952 | $ 12,116,129 | $ 11,622,093 |  |  |  |  |  |
Laundry and Sundry Income | 44,100 | 36,638 | 86,033 | 69,339 |  |  |  |  |  |
Total Revenues | 6,069,506 | 5,886,590 | 12,202,162 | 11,691,432 |  |  |  |  |  |
Expenses |  |  |  |  |  |  |  |  |  |
Administrative | 75,361 | 80,321 | 168,714 | 162,417 |  |  |  |  |  |
Depreciation and amortization | 1,482,711 | 1,469,370 | 2,954,638 | 2,932,705 |  |  |  |  |  |
Management Fees | 178,086 | 176,068 | 353,799 | 343,488 |  |  |  |  |  |
Operating | 390,264 | 367,515 | 894,324 | 1,072,391 |  |  |  |  |  |
Renting | 50,986 | 28,540 | 90,035 | 59,536 |  |  |  |  |  |
Repairs and Maintenance | 760,666 | 685,986 | 1,409,909 | 1,206,400 |  |  |  |  |  |
Taxes and Insurance | 715,582 | 669,580 | 1,436,671 | 1,328,837 |  |  |  |  |  |
Total Expenses | 3,653,656 | 3,477,380 | 7,308,090 | 7,105,774 |  |  |  |  |  |
Income Before Other Income | 2,415,850 | 2,409,210 | 4,894,072 | 4,585,658 |  |  |  |  |  |
Other Income (loss) |  |  |  |  |  |  |  |  |  |
Interest Expense | (1,787,741) | (1,877,917) | (3,581,247) | (3,742,642) |  |  |  |  |  |
Interest Income | 5 | 1 | 9 | 8 |  |  |  |  |  |
Other Income (Expense) |  |  |  | (28) |  |  |  |  |  |
Gain on Sale of Real Estate | 67,462 | 96 | 235,470 |  |  |  |  |  |  |
Total Other Income (Loss) | (1,720,274) | (1,877,820) | (3,345,768) | (3,742,662) |  |  |  |  |  |
Net Income (Loss) | 695,576 | 531,390 | 1,548,304 | 842,996 |  |  |  |  |  |
Proportionate share of net income (loss) | 288,478 | 221,586 | 658,082 | 346,820 |  |  |  |  |  |
Investment Properties | NERA 50% |  |  |  |  |  |  |  |  |  |
Other Income (loss) |  |  |  |  |  |  |  |  |  |
Proportionate share of net income (loss) | 51,238 | 45,142 | 193,802 | 48,106 |  |  |  |  |  |
Investment Properties | NERA 40% |  |  |  |  |  |  |  |  |  |
Other Income (loss) |  |  |  |  |  |  |  |  |  |
Proportionate share of net income (loss) | 237,240 | 176,445 | 464,280 | 298,714 |  |  |  |  |  |
Hamilton Essex 81 | NERA 50% |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |
Rental income | 369,120 | 362,007 | 767,917 | 721,908 |  |  |  |  |  |
Laundry and Sundry Income | 4,375 |  | 8,357 | 2,492 |  |  |  |  |  |
Total Revenues | 373,495 | 362,007 | 776,274 | 724,400 |  |  |  |  |  |
Expenses |  |  |  |  |  |  |  |  |  |
Administrative | 4,545 | 4,369 | 20,096 | 8,306 |  |  |  |  |  |
Depreciation and amortization | 113,230 | 108,848 | 225,194 | 216,187 |  |  |  |  |  |
Management Fees | 15,366 | 16,392 | 30,050 | 31,737 |  |  |  |  |  |
Operating | 19,855 | 21,230 | 50,358 | 58,763 |  |  |  |  |  |
Renting | 6,299 | 6,221 | 6,839 | 6,721 |  |  |  |  |  |
Repairs and Maintenance | 42,149 | 40,751 | 76,084 | 66,434 |  |  |  |  |  |
Taxes and Insurance | 57,873 | 53,458 | 115,308 | 106,875 |  |  |  |  |  |
Total Expenses | 259,317 | 251,269 | 523,929 | 495,023 |  |  |  |  |  |
Income Before Other Income | 114,178 | 110,738 | 252,345 | 229,377 |  |  |  |  |  |
Other Income (loss) |  |  |  |  |  |  |  |  |  |
Interest Expense | (71,039) | (123,160) | (141,647) | (245,523) |  |  |  |  |  |
Total Other Income (Loss) | (71,039) | (123,160) | (141,647) | (245,523) |  |  |  |  |  |
Net Income (Loss) | 43,139 | (12,422) | 110,698 | (16,146) |  |  |  |  |  |
Proportionate share of net income (loss) | $ 21,570 | $ (6,211) | $ 55,349 | $ (8,073) |  |  |  |  |  |
Ownership interest (as a percent) | 50.00% | 50.00% | 50.00% | 50.00% |  |  |  |  |  |
Hamilton Essex Development | NERA 50% |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |
Rental income | $ 60,000 | $ 72,523 | $ 120,000 | $ 145,045 |  |  |  |  |  |
Total Revenues | 60,000 | 72,523 | 120,000 | 145,045 |  |  |  |  |  |
Expenses |  |  |  |  |  |  |  |  |  |
Administrative | 464 | 425 | 889 | 1,008 |  |  |  |  |  |
Depreciation and amortization | 707 | 707 | 1,415 | 1,415 |  |  |  |  |  |
Management Fees | 2,400 | 2,901 | 4,800 | 5,802 |  |  |  |  |  |
Repairs and Maintenance | 3,150 |  | 3,150 |  |  |  |  |  |  |
Taxes and Insurance | 15,431 | 13,423 | 30,602 | 26,844 |  |  |  |  |  |
Total Expenses | 22,152 | 17,456 | 40,856 | 35,069 |  |  |  |  |  |
Income Before Other Income | 37,848 | 55,067 | 79,144 | 109,976 |  |  |  |  |  |
Other Income (loss) |  |  |  |  |  |  |  |  |  |
Interest Expense |  | (15,734) |  | (31,401) |  |  |  |  |  |
Total Other Income (Loss) |  | (15,734) |  | (31,401) |  |  |  |  |  |
Net Income (Loss) | 37,848 | 39,333 | 79,144 | 78,575 |  |  |  |  |  |
Proportionate share of net income (loss) | $ 18,924 | $ 19,667 | $ 39,572 | $ 39,287 |  |  |  |  |  |
Ownership interest (as a percent) | 50.00% | 50.00% | 50.00% | 50.00% |  |  |  |  |  |
345 Franklin |  |  |  |  |  |  |  |  |  |
Other Income (loss) |  |  |  |  |  |  |  |  |  |
Ownership interest (as a percent) |  |  |  |  |  |  |  |  |  | 50.00%
345 Franklin | NERA 50% |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |
Rental income | $ 358,043 | $ 342,800 | $ 724,962 | $ 678,276 |  |  |  |  |  |
Laundry and Sundry Income | 507 |  | 2,097 | 323 |  |  |  |  |  |
Total Revenues | 358,550 | 342,800 | 727,059 | 678,599 |  |  |  |  |  |
Expenses |  |  |  |  |  |  |  |  |  |
Administrative | 6,211 | 6,620 | 16,198 | 14,381 |  |  |  |  |  |
Depreciation and amortization | 86,915 | 92,128 | 173,831 | 184,256 |  |  |  |  |  |
Management Fees | 15,988 | 15,131 | 30,825 | 29,240 |  |  |  |  |  |
Operating | 16,542 | 11,114 | 36,666 | 51,186 |  |  |  |  |  |
Renting | 10,355 | 2,760 | 10,540 | 9,105 |  |  |  |  |  |
Repairs and Maintenance | 12,627 | 13,075 | 29,334 | 19,062 |  |  |  |  |  |
Taxes and Insurance | 30,407 | 29,941 | 64,423 | 59,877 |  |  |  |  |  |
Total Expenses | 179,045 | 170,769 | 361,817 | 367,107 |  |  |  |  |  |
Income Before Other Income | 179,505 | 172,031 | 365,242 | 311,492 |  |  |  |  |  |
Other Income (loss) |  |  |  |  |  |  |  |  |  |
Interest Expense | (99,505) | (99,667) | (199,009) | (199,268) |  |  |  |  |  |
Total Other Income (Loss) | (99,505) | (99,667) | (199,009) | (199,268) |  |  |  |  |  |
Net Income (Loss) | 80,000 | 72,364 | 166,233 | 112,224 |  |  |  |  |  |
Proportionate share of net income (loss) | $ 40,000 | $ 36,182 | $ 83,117 | $ 56,111 |  |  |  |  |  |
Ownership interest (as a percent) | 50.00% | 50.00% | 50.00% | 50.00% |  |  |  |  |  |
Hamilton 1025 |  |  |  |  |  |  |  |  |  |
Other Income (loss) |  |  |  |  |  |  |  |  |  |
Ownership interest (as a percent) |  |  |  |  |  |  | 50.00% |  |  |
Hamilton 1025 | NERA 50% |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |
Rental income | $ 237,156 | $ 237,028 | $ 472,476 | $ 477,428 |  |  |  |  |  |
Total Revenues | 237,156 | 237,028 | 472,476 | 477,428 |  |  |  |  |  |
Expenses |  |  |  |  |  |  |  |  |  |
Administrative | 1,319 | 1,170 | 2,745 | 3,162 |  |  |  |  |  |
Depreciation and amortization | 58,999 | 58,777 | 118,064 | 117,548 |  |  |  |  |  |
Management Fees | 8,402 | 9,391 | 17,927 | 18,831 |  |  |  |  |  |
Operating | 220 | 223 | 585 | 348 |  |  |  |  |  |
Renting | 1,789 |  | 1,789 |  |  |  |  |  |  |
Repairs and Maintenance | 78,417 | 78,891 | 155,898 | 155,388 |  |  |  |  |  |
Taxes and Insurance | 43,260 | 42,844 | 86,209 | 85,895 |  |  |  |  |  |
Total Expenses | 192,406 | 191,296 | 383,217 | 381,172 |  |  |  |  |  |
Income Before Other Income | 44,750 | 45,732 | 89,259 | 96,256 |  |  |  |  |  |
Other Income (loss) |  |  |  |  |  |  |  |  |  |
Interest Expense | (69,173) | (70,209) | (138,688) | (139,954) |  |  |  |  |  |
Interest Income | 5 | 1 | 9 | 8 |  |  |  |  |  |
Total Other Income (Loss) | (69,168) | (70,208) | (138,679) | (139,946) |  |  |  |  |  |
Net Income (Loss) | (24,418) | (24,476) | (49,420) | (43,690) |  |  |  |  |  |
Proportionate share of net income (loss) | $ (12,209) | $ (12,238) | $ (24,710) | $ (21,845) |  |  |  |  |  |
Ownership interest (as a percent) | 50.00% | 50.00% | 50.00% | 50.00% |  |  |  |  |  |
Hamilton Bay Sales | NERA 50% |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |
Rental income | $ 11,025 | $ 30,173 | $ 27,690 | $ 59,468 |  |  |  |  |  |
Total Revenues | 11,025 | 30,173 | 27,690 | 59,468 |  |  |  |  |  |
Expenses |  |  |  |  |  |  |  |  |  |
Administrative | 1,085 | 1,895 | 2,984 | 4,674 |  |  |  |  |  |
Depreciation and amortization | 6,291 | 8,988 | 12,584 | 17,974 |  |  |  |  |  |
Management Fees | 406 | 1,049 | 1,076 | 2,323 |  |  |  |  |  |
Operating | 48 | 181 | 200 | 205 |  |  |  |  |  |
Repairs and Maintenance | 5,551 | 12,390 | 13,569 | 23,876 |  |  |  |  |  |
Taxes and Insurance | 2,855 | 5,056 | 7,071 | 10,936 |  |  |  |  |  |
Total Expenses | 16,236 | 29,559 | 37,484 | 59,988 |  |  |  |  |  |
Income Before Other Income | (5,211) | 614 | (9,794) | (520) |  |  |  |  |  |
Other Income (loss) |  |  |  |  |  |  |  |  |  |
Interest Expense | (11) | (104) | (59) | (214) |  |  |  |  |  |
Other Income (Expense) |  |  |  | (125) |  |  |  |  |  |
Gain on Sale of Real Estate | 67,462 |  | 235,470 |  |  |  |  |  |  |
Total Other Income (Loss) | 67,451 | (104) | 235,411 | (339) |  |  |  |  |  |
Net Income (Loss) | 62,240 | 510 | 225,617 | (859) |  |  |  |  |  |
Proportionate share of net income (loss) | $ 31,120 | $ 255 | $ 112,809 | $ (430) |  |  |  |  |  |
Ownership interest (as a percent) | 50.00% | 50.00% | 50.00% | 50.00% |  |  |  |  |  |
Hamilton Bay Apts |  |  |  |  |  |  |  |  |  |
Other Income (loss) |  |  |  |  |  |  |  |  |  |
Ownership interest (as a percent) |  |  |  |  |  | 50.00% |  |  |  |
Hamilton Bay Apts | NERA 50% |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |
Rental income | $ 245,530 | $ 236,513 | $ 494,357 | $ 487,086 |  |  |  |  |  |
Total Revenues | 245,530 | 236,513 | 494,357 | 487,086 |  |  |  |  |  |
Expenses |  |  |  |  |  |  |  |  |  |
Administrative | 3,890 | 1,809 | 5,870 | 3,624 |  |  |  |  |  |
Depreciation and amortization | 79,462 | 78,372 | 158,855 | 156,110 |  |  |  |  |  |
Management Fees | 9,362 | 9,937 | 19,604 | 19,432 |  |  |  |  |  |
Operating | 714 | 44 | 1,008 | 708 |  |  |  |  |  |
Renting | 477 |  | 954 | 2,350 |  |  |  |  |  |
Repairs and Maintenance | 100,814 | 101,359 | 200,605 | 186,217 |  |  |  |  |  |
Taxes and Insurance | 42,070 | 38,394 | 83,979 | 76,225 |  |  |  |  |  |
Total Expenses | 236,789 | 229,915 | 470,875 | 444,666 |  |  |  |  |  |
Income Before Other Income | 8,741 | 6,598 | 23,482 | 42,420 |  |  |  |  |  |
Other Income (loss) |  |  |  |  |  |  |  |  |  |
Interest Expense | (65,065) | (66,366) | (130,978) | (132,420) |  |  |  |  |  |
Total Other Income (Loss) | (65,065) | (66,366) | (130,978) | (132,420) |  |  |  |  |  |
Net Income (Loss) | (56,324) | (59,768) | (107,496) | (90,000) |  |  |  |  |  |
Proportionate share of net income (loss) | $ (28,162) | $ (29,884) | $ (53,748) | $ (45,000) |  |  |  |  |  |
Ownership interest (as a percent) | 50.00% | 50.00% | 50.00% | 50.00% |  |  |  |  |  |
Hamilton Minuteman |  |  |  |  |  |  |  |  |  |
Other Income (loss) |  |  |  |  |  |  |  |  |  |
Ownership interest (as a percent) |  |  |  |  |  |  |  | 50.00% |  |
Hamilton Minuteman | NERA 50% |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |
Rental income | $ 243,193 | $ 233,578 | $ 491,754 | $ 467,474 |  |  |  |  |  |
Laundry and Sundry Income | 53 |  | 299 |  |  |  |  |  |  |
Total Revenues | 243,246 | 233,578 | 492,053 | 467,474 |  |  |  |  |  |
Expenses |  |  |  |  |  |  |  |  |  |
Administrative | 1,293 | 1,069 | 2,600 | 2,693 |  |  |  |  |  |
Depreciation and amortization | 84,896 | 80,984 | 169,581 | 161,510 |  |  |  |  |  |
Management Fees | 9,588 | 9,620 | 19,922 | 19,445 |  |  |  |  |  |
Operating | 22,568 | 13,935 | 46,231 | 46,482 |  |  |  |  |  |
Renting | 947 | 1,003 | 4,802 | 4,746 |  |  |  |  |  |
Repairs and Maintenance | 57,281 | 17,640 | 110,941 | 32,764 |  |  |  |  |  |
Taxes and Insurance | 30,075 | 31,013 | 59,499 | 61,971 |  |  |  |  |  |
Total Expenses | 206,648 | 155,264 | 413,576 | 329,611 |  |  |  |  |  |
Income Before Other Income | 36,598 | 78,314 | 78,477 | 137,863 |  |  |  |  |  |
Other Income (loss) |  |  |  |  |  |  |  |  |  |
Interest Expense | (76,031) | (77,058) | (152,347) | (153,541) |  |  |  |  |  |
Total Other Income (Loss) | (76,031) | (77,058) | (152,347) | (153,541) |  |  |  |  |  |
Net Income (Loss) | (39,433) | 1,256 | (73,870) | (15,678) |  |  |  |  |  |
Proportionate share of net income (loss) | $ (19,717) | $ 628 | $ (36,935) | $ (7,839) |  |  |  |  |  |
Ownership interest (as a percent) | 50.00% | 50.00% | 50.00% | 50.00% |  |  |  |  |  |
Hamilton on Main Apts |  |  |  |  |  |  |  |  |  |
Other Income (loss) |  |  |  |  |  |  |  |  |  |
Ownership interest (as a percent) |  |  |  |  |  |  |  |  | 50.00% |
Hamilton on Main Apts | NERA 50% |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |
Rental income | $ 806,669 | $ 762,855 | $ 1,604,997 | $ 1,524,128 |  |  |  |  |  |
Laundry and Sundry Income | 10,051 | 11,805 | 20,634 | 22,446 |  |  |  |  |  |
Total Revenues | 816,720 | 774,660 | 1,625,631 | 1,546,574 |  |  |  |  |  |
Expenses |  |  |  |  |  |  |  |  |  |
Administrative | 8,623 | 10,660 | 20,131 | 19,935 |  |  |  |  |  |
Depreciation and amortization | 239,165 | 238,342 | 477,061 | 475,090 |  |  |  |  |  |
Management Fees | 32,337 | 30,974 | 64,262 | 61,054 |  |  |  |  |  |
Operating | 81,925 | 46,638 | 151,015 | 184,893 |  |  |  |  |  |
Renting | 4,013 | 1,636 | 9,516 | 3,401 |  |  |  |  |  |
Repairs and Maintenance | 131,233 | 98,321 | 227,253 | 182,482 |  |  |  |  |  |
Taxes and Insurance | 128,012 | 82,793 | 255,822 | 166,301 |  |  |  |  |  |
Total Expenses | 625,308 | 509,364 | 1,205,060 | 1,093,156 |  |  |  |  |  |
Income Before Other Income | 191,412 | 265,296 | 420,571 | 453,418 |  |  |  |  |  |
Other Income (loss) |  |  |  |  |  |  |  |  |  |
Interest Expense | (191,988) | (191,906) | (383,871) | (381,729) |  |  |  |  |  |
Other Income (Expense) |  |  |  | 97 |  |  |  |  |  |
Gain on Sale of Real Estate |  | 96 |  |  |  |  |  |  |  |
Total Other Income (Loss) | (191,988) | (191,810) | (383,871) | (381,632) |  |  |  |  |  |
Net Income (Loss) | (576) | 73,486 | 36,700 | 71,786 |  |  |  |  |  |
Proportionate share of net income (loss) | $ (288) | $ 36,743 | $ 18,350 | $ 35,893 |  |  |  |  |  |
Ownership interest (as a percent) | 50.00% | 50.00% | 50.00% | 50.00% |  |  |  |  |  |
Dexter Park |  |  |  |  |  |  |  |  |  |
Other Income (loss) |  |  |  |  |  |  |  |  |  |
Ownership interest (as a percent) |  |  |  |  | 40.00% |  |  |  |  |
Dexter Park | NERA 40% |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |
Rental income | $ 3,694,670 | $ 3,572,475 | $ 7,411,976 | $ 7,061,280 |  |  |  |  |  |
Laundry and Sundry Income | 29,114 | 24,833 | 54,646 | 44,078 |  |  |  |  |  |
Total Revenues | 3,723,784 | 3,597,308 | 7,466,622 | 7,105,358 |  |  |  |  |  |
Expenses |  |  |  |  |  |  |  |  |  |
Administrative | 47,931 | 52,304 | 97,201 | 104,634 |  |  |  |  |  |
Depreciation and amortization | 813,046 | 802,224 | 1,618,053 | 1,602,615 |  |  |  |  |  |
Management Fees | 84,237 | 80,673 | 165,333 | 155,624 |  |  |  |  |  |
Operating | 248,392 | 274,150 | 608,261 | 729,806 |  |  |  |  |  |
Renting | 27,106 | 16,920 | 55,595 | 33,213 |  |  |  |  |  |
Repairs and Maintenance | 329,444 | 323,559 | 593,075 | 540,177 |  |  |  |  |  |
Taxes and Insurance | 365,599 | 372,658 | 733,758 | 733,913 |  |  |  |  |  |
Total Expenses | 1,915,755 | 1,922,488 | 3,871,276 | 3,899,982 |  |  |  |  |  |
Income Before Other Income | 1,808,029 | 1,674,820 | 3,595,346 | 3,205,376 |  |  |  |  |  |
Other Income (loss) |  |  |  |  |  |  |  |  |  |
Interest Expense | (1,214,929) | (1,233,713) | (2,434,648) | (2,458,592) |  |  |  |  |  |
Total Other Income (Loss) | (1,214,929) | (1,233,713) | (2,434,648) | (2,458,592) |  |  |  |  |  |
Net Income (Loss) | 593,100 | 441,107 | 1,160,698 | 746,784 |  |  |  |  |  |
Proportionate share of net income (loss) | $ 237,240 | $ 176,445 | $ 464,280 | $ 298,714 |  |  |  |  |  |
Ownership interest (as a percent) | 40.00% | 40.00% | 40.00% | 40.00% |  |  |  |  |  |

X
- Definition The aggregate costs of keeping the property in good condition but that do not appreciably prolong the life or increase the value of the property reported by an equity method investment of the entity. + References No definition available. + Details
Name: | nen_EquityMethodInvestmentSummarizedFinancialInformationCostOfPropertyRepairsAndMaintenance
Namespace Prefix: | nen_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets reported by an equity method investment of the entity. + References No definition available. + Details
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