XML 72 R62.htm IDEA: XBRL DOCUMENT
v3.19.2

INVESTMENT IN UNCONSOLIDATED JOINT VENTURES (Income) (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Oct. 28, 2009 | Oct. 03, 2005 | Mar. 02, 2005 | Sep. 30, 2004 | Aug. 31, 2004 | Nov. 30, 2001
Revenues |  |  |  |  |  |  |  |  |  |
Rental income | $ 6,097,079 | $ 5,918,704 | $ 12,170,173 | $ 11,865,056 |  |  |  |  |  |
Laundry and Sundry Income | 38,001 | 44,226 | 78,389 | 81,860 |  |  |  |  |  |
Total Revenues | 6,135,080 | 5,962,930 | 12,248,562 | 11,946,916 |  |  |  |  |  |
Expenses |  |  |  |  |  |  |  |  |  |
Administrative | 85,144 | 107,753 | 180,167 | 209,319 |  |  |  |  |  |
Depreciation and amortization | 1,471,070 | 1,455,912 | 2,937,666 | 2,884,483 |  |  |  |  |  |
Management Fees | 163,373 | 169,769 | 326,989 | 329,609 |  |  |  |  |  |
Operating | 363,687 | 449,258 | 921,175 | 1,035,337 |  |  |  |  |  |
Renting | 66,466 | 99,537 | 111,123 | 145,134 |  |  |  |  |  |
Repairs and Maintenance | 620,035 | 615,611 | 1,112,141 | 1,284,594 |  |  |  |  |  |
Taxes and Insurance | 771,892 | 681,764 | 1,557,303 | 1,392,161 |  |  |  |  |  |
Total Expenses | 3,541,667 | 3,579,604 | 7,146,564 | 7,280,637 |  |  |  |  |  |
Income Before Other Income | 2,593,413 | 2,383,326 | 5,101,998 | 4,666,279 |  |  |  |  |  |
Other Income (loss) |  |  |  |  |  |  |  |  |  |
Interest Expense | (1,735,366) | (1,777,262) | (3,466,987) | (3,386,606) |  |  |  |  |  |
Other Income (Expense) |  |  |  | (3,829,950) |  |  |  |  |  |
Gain on Sale of Real Estate | 305,320 | 1,411,960 | 738,983 | 3,056,723 |  |  |  |  |  |
Total Other Income (Loss) | (1,430,046) | (365,302) | (2,728,004) | (4,159,833) |  |  |  |  |  |
Net Income (Loss) | 1,163,367 | 2,018,024 | 2,373,994 | 506,446 |  |  |  |  |  |
Proportionate share of net income (loss) | 513,406 | (561,639) | 1,062,345 | 539,262 |  |  |  |  |  |
NERA 50% |  |  |  |  |  |  |  |  |  |
Other Income (loss) |  |  |  |  |  |  |  |  |  |
Proportionate share of net income (loss) | $ 240,292 | $ 815,658 | $ 563,716 | $ 1,683,416 |  |  |  |  |  |
Ownership interest (as a percent) | 50.00% | 50.00% | 50.00% | 50.00% |  |  |  |  |  |
NERA 40% |  |  |  |  |  |  |  |  |  |
Other Income (loss) |  |  |  |  |  |  |  |  |  |
Proportionate share of net income (loss) | $ 273,114 | $ (1,377,297) | $ 498,630 | $ (1,144,154) |  |  |  |  |  |
Ownership interest (as a percent) | 40.00% | 40.00% | 40.00% | 40.00% |  |  |  |  |  |
Hamilton Essex 81 |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |
Rental income | $ 450,538 | $ 406,813 | $ 910,111 | $ 818,035 |  |  |  |  |  |
Laundry and Sundry Income | 3,865 | 4,380 | 6,870 | 7,385 |  |  |  |  |  |
Total Revenues | 454,403 | 411,193 | 916,981 | 825,420 |  |  |  |  |  |
Expenses |  |  |  |  |  |  |  |  |  |
Administrative | 9,876 | 3,629 | 15,255 | 13,309 |  |  |  |  |  |
Depreciation and amortization | 119,887 | 119,697 | 239,432 | 233,982 |  |  |  |  |  |
Management Fees | 17,021 | 15,505 | 34,227 | 28,709 |  |  |  |  |  |
Operating | 15,594 | 15,903 | 37,045 | 40,034 |  |  |  |  |  |
Renting | 5,187 | 7,760 | 8,517 | 11,050 |  |  |  |  |  |
Repairs and Maintenance | 26,786 | 31,680 | 64,670 | 86,181 |  |  |  |  |  |
Taxes and Insurance | 61,476 | 62,662 | 123,306 | 125,189 |  |  |  |  |  |
Total Expenses | 255,827 | 256,836 | 522,452 | 538,454 |  |  |  |  |  |
Income Before Other Income | 198,576 | 154,357 | 394,529 | 286,966 |  |  |  |  |  |
Other Income (loss) |  |  |  |  |  |  |  |  |  |
Interest Expense | (122,015) | (108,607) | (243,020) | (207,920) |  |  |  |  |  |
Total Other Income (Loss) | (122,015) | (108,607) | (243,020) | (207,920) |  |  |  |  |  |
Net Income (Loss) | 76,561 | $ 45,750 | 151,509 | $ 79,046 |  |  |  |  |  |
Ownership interest (as a percent) |  | 50.00% |  | 50.00% |  |  |  |  |  |
Hamilton Essex 81 | NERA 50% |  |  |  |  |  |  |  |  |  |
Other Income (loss) |  |  |  |  |  |  |  |  |  |
Proportionate share of net income (loss) | $ 38,281 | $ 22,875 | $ 75,755 | $ 39,523 |  |  |  |  |  |
Ownership interest (as a percent) | 50.00% |  | 50.00% |  |  |  |  |  |  |
Hamilton Essex Development |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |
Rental income | $ 25,951 | 53,928 | $ 101,241 | 107,856 |  |  |  |  |  |
Total Revenues | 25,951 | 53,928 | 101,241 | 107,856 |  |  |  |  |  |
Expenses |  |  |  |  |  |  |  |  |  |
Administrative | 7,582 | 5,527 | 9,674 | 6,014 |  |  |  |  |  |
Depreciation and amortization | 5,075 | 664 | 10,149 | 1,329 |  |  |  |  |  |
Management Fees | 2,160 | 2,157 | 4,320 | 4,314 |  |  |  |  |  |
Operating |  |  | 8 |  |  |  |  |  |  |
Repairs and Maintenance | 3,180 | 3,180 | 3,180 | 7,343 |  |  |  |  |  |
Taxes and Insurance | 15,183 | 16,473 | 30,860 | 33,196 |  |  |  |  |  |
Total Expenses | 33,180 | 28,001 | 58,191 | 52,196 |  |  |  |  |  |
Income Before Other Income | (7,229) | 25,927 | 43,050 | 55,660 |  |  |  |  |  |
Other Income (loss) |  |  |  |  |  |  |  |  |  |
Net Income (Loss) | (7,229) | $ 25,927 | 43,050 | $ 55,660 |  |  |  |  |  |
Ownership interest (as a percent) |  | 50.00% |  | 50.00% |  |  |  |  |  |
Hamilton Essex Development | NERA 50% |  |  |  |  |  |  |  |  |  |
Other Income (loss) |  |  |  |  |  |  |  |  |  |
Proportionate share of net income (loss) | $ (3,614) | $ 12,964 | $ 21,525 | $ 27,830 |  |  |  |  |  |
Ownership interest (as a percent) | 50.00% |  | 50.00% |  |  |  |  |  |  |
345 Franklin |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |
Rental income | $ 417,850 | 388,256 | $ 803,093 | 792,092 |  |  |  |  |  |
Laundry and Sundry Income | (805) | 1,544 | 584 | 2,761 |  |  |  |  |  |
Total Revenues | 417,045 | 389,800 | 803,677 | 794,853 |  |  |  |  |  |
Expenses |  |  |  |  |  |  |  |  |  |
Administrative | 4,653 | 6,739 | 10,043 | 13,194 |  |  |  |  |  |
Depreciation and amortization | 86,226 | 86,508 | 172,453 | 172,759 |  |  |  |  |  |
Management Fees | 16,387 | 16,673 | 30,443 | 32,799 |  |  |  |  |  |
Operating | 17,921 | 16,338 | 40,524 | 36,919 |  |  |  |  |  |
Renting | 8,473 | 4,720 | 11,993 | 5,217 |  |  |  |  |  |
Repairs and Maintenance | 23,810 | 25,415 | 42,277 | 46,911 |  |  |  |  |  |
Taxes and Insurance | 35,369 | 30,538 | 75,609 | 72,169 |  |  |  |  |  |
Total Expenses | 192,839 | 186,931 | 383,342 | 379,968 |  |  |  |  |  |
Income Before Other Income | 224,206 | 202,869 | 420,335 | 414,885 |  |  |  |  |  |
Other Income (loss) |  |  |  |  |  |  |  |  |  |
Interest Expense | (94,834) | (96,514) | (189,082) | (193,475) |  |  |  |  |  |
Total Other Income (Loss) | (94,834) | (96,514) | (189,082) | (193,475) |  |  |  |  |  |
Net Income (Loss) | 129,372 | $ 106,355 | 231,253 | $ 221,410 |  |  |  |  |  |
Ownership interest (as a percent) |  | 50.00% |  | 50.00% |  |  |  |  |  | 50.00%
345 Franklin | NERA 50% |  |  |  |  |  |  |  |  |  |
Other Income (loss) |  |  |  |  |  |  |  |  |  |
Proportionate share of net income (loss) | $ 64,686 | $ 53,178 | $ 115,627 | $ 110,705 |  |  |  |  |  |
Ownership interest (as a percent) | 50.00% |  | 50.00% |  |  |  |  |  |  |
Hamilton 1025 |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |
Rental income | $ 23,466 | 32,141 | $ 47,061 | 70,361 |  |  |  |  |  |
Total Revenues | 23,466 | 32,141 | 47,061 | 70,361 |  |  |  |  |  |
Expenses |  |  |  |  |  |  |  |  |  |
Administrative | 2,708 | 1,071 | 4,402 | 2,570 |  |  |  |  |  |
Depreciation and amortization | 3,195 |  | 6,391 |  |  |  |  |  |  |
Management Fees | 934 | 1,106 | 1,899 | 2,614 |  |  |  |  |  |
Operating | 88 | 30 | 862 | 187 |  |  |  |  |  |
Renting |  | 108 |  | 108 |  |  |  |  |  |
Repairs and Maintenance | 20,359 | 28,367 | 28,399 | 68,574 |  |  |  |  |  |
Taxes and Insurance | 7,096 | 12,696 | 14,445 | 30,867 |  |  |  |  |  |
Total Expenses | 34,380 | 43,378 | 56,398 | 104,920 |  |  |  |  |  |
Income Before Other Income | (10,914) | (11,237) | (9,337) | (34,559) |  |  |  |  |  |
Other Income (loss) |  |  |  |  |  |  |  |  |  |
Interest Expense |  | (21) |  | (46) |  |  |  |  |  |
Gain on Sale of Real Estate | 305,320 | 488,408 | 306,075 | 1,305,414 |  |  |  |  |  |
Total Other Income (Loss) | 305,320 | 488,387 | 306,075 | 1,305,368 |  |  |  |  |  |
Net Income (Loss) | 294,406 | $ 477,150 | 296,738 | $ 1,270,809 |  |  |  |  |  |
Ownership interest (as a percent) |  | 50.00% |  | 50.00% |  |  | 50.00% |  |  |
Hamilton 1025 | NERA 50% |  |  |  |  |  |  |  |  |  |
Other Income (loss) |  |  |  |  |  |  |  |  |  |
Proportionate share of net income (loss) | $ 147,203 | $ 238,575 | $ 148,369 | $ 635,405 |  |  |  |  |  |
Ownership interest (as a percent) | 50.00% |  | 50.00% |  |  |  |  |  |  |
Hamilton Bay Apts |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |
Rental income |  | 23,240 | $ 3,629 | 45,443 |  |  |  |  |  |
Total Revenues |  | 23,240 | 3,629 | 45,443 |  |  |  |  |  |
Expenses |  |  |  |  |  |  |  |  |  |
Administrative | $ 841 | 5,359 | 4,214 | 8,425 |  |  |  |  |  |
Depreciation and amortization |  | 12,000 | 5,420 | 22,000 |  |  |  |  |  |
Management Fees |  | 898 | 145 | 1,920 |  |  |  |  |  |
Operating | 37 | 365 |  | 1,190 |  |  |  |  |  |
Repairs and Maintenance |  | 23,610 | 10,266 | 57,834 |  |  |  |  |  |
Taxes and Insurance | 300 | 9,113 | 5,206 | 25,572 |  |  |  |  |  |
Total Expenses | 1,178 | 51,345 | 25,251 | 116,941 |  |  |  |  |  |
Income Before Other Income | (1,178) | (28,105) | (21,622) | (71,498) |  |  |  |  |  |
Other Income (loss) |  |  |  |  |  |  |  |  |  |
Interest Expense |  | (26) | (6) | (75) |  |  |  |  |  |
Gain on Sale of Real Estate |  | 923,552 | 432,908 | 1,751,309 |  |  |  |  |  |
Total Other Income (Loss) |  | 923,526 | 432,902 | 1,751,234 |  |  |  |  |  |
Net Income (Loss) | (1,178) | $ 895,421 | 411,280 | $ 1,679,736 |  |  |  |  |  |
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) | $ (589) | $ 447,711 | $ 205,641 | $ 839,868 |  |  |  |  |  |
Ownership interest (as a percent) | 50.00% |  | 50.00% |  |  |  |  |  |  |
Hamilton Minuteman |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |
Rental income | $ 281,232 | 264,810 | $ 556,069 | 528,938 |  |  |  |  |  |
Laundry and Sundry Income | 228 |  | 2,135 | (402) |  |  |  |  |  |
Total Revenues | 281,460 | 264,810 | 558,204 | 528,536 |  |  |  |  |  |
Expenses |  |  |  |  |  |  |  |  |  |
Administrative | 2,034 | 2,556 | 5,750 | 4,380 |  |  |  |  |  |
Depreciation and amortization | 88,906 | 88,121 | 177,501 | 175,843 |  |  |  |  |  |
Management Fees | 11,232 | 10,493 | 22,299 | 20,861 |  |  |  |  |  |
Operating | 27,824 | 26,525 | 51,579 | 60,375 |  |  |  |  |  |
Renting | 542 | 931 | 2,574 | 4,308 |  |  |  |  |  |
Repairs and Maintenance | 45,649 | 25,807 | 82,321 | 45,424 |  |  |  |  |  |
Taxes and Insurance | 32,518 | 31,604 | 64,769 | 62,650 |  |  |  |  |  |
Total Expenses | 208,705 | 186,037 | 406,793 | 373,841 |  |  |  |  |  |
Income Before Other Income | 72,755 | 78,773 | 151,411 | 154,695 |  |  |  |  |  |
Other Income (loss) |  |  |  |  |  |  |  |  |  |
Interest Expense | (58,613) | (58,889) | (116,605) | (117,409) |  |  |  |  |  |
Total Other Income (Loss) | (58,613) | (58,889) | (116,605) | (117,409) |  |  |  |  |  |
Net Income (Loss) | 14,142 | $ 19,884 | 34,806 | $ 37,286 |  |  |  |  |  |
Ownership interest (as a percent) |  | 50.00% |  | 50.00% |  |  |  | 50.00% |  |
Hamilton Minuteman | NERA 50% |  |  |  |  |  |  |  |  |  |
Other Income (loss) |  |  |  |  |  |  |  |  |  |
Proportionate share of net income (loss) | $ 7,071 | $ 9,942 | $ 17,403 | $ 18,643 |  |  |  |  |  |
Ownership interest (as a percent) | 50.00% |  | 50.00% |  |  |  |  |  |  |
Hamilton on Main Apts |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |
Rental income | $ 865,335 | 883,327 | $ 1,688,003 | 1,741,539 |  |  |  |  |  |
Laundry and Sundry Income | 10,018 | 9,905 | 20,080 | 19,031 |  |  |  |  |  |
Total Revenues | 875,353 | 893,232 | 1,708,083 | 1,760,570 |  |  |  |  |  |
Expenses |  |  |  |  |  |  |  |  |  |
Administrative | 17,065 | 14,063 | 34,912 | 27,189 |  |  |  |  |  |
Depreciation and amortization | 260,668 | 257,444 | 519,106 | 512,950 |  |  |  |  |  |
Management Fees | 33,135 | 33,609 | 65,003 | 66,052 |  |  |  |  |  |
Operating | 84,527 | 82,889 | 191,817 | 203,282 |  |  |  |  |  |
Renting | 17,378 | 5,858 | 33,490 | 14,509 |  |  |  |  |  |
Repairs and Maintenance | 192,894 | 143,666 | 317,086 | 326,040 |  |  |  |  |  |
Taxes and Insurance | 102,907 | 103,474 | 207,339 | 208,025 |  |  |  |  |  |
Total Expenses | 708,574 | 641,003 | 1,368,753 | 1,358,047 |  |  |  |  |  |
Income Before Other Income | 166,779 | 252,229 | 339,330 | 402,523 |  |  |  |  |  |
Other Income (loss) |  |  |  |  |  |  |  |  |  |
Interest Expense | (192,271) | (191,400) | (380,539) | (379,639) |  |  |  |  |  |
Total Other Income (Loss) | (192,271) | (191,400) | (380,539) | (379,639) |  |  |  |  |  |
Net Income (Loss) | (25,492) | $ 60,829 | (41,209) | $ 22,884 |  |  |  |  |  |
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) | $ (12,746) | $ 30,415 | $ (20,604) | $ 11,442 |  |  |  |  |  |
Ownership interest (as a percent) | 50.00% |  | 50.00% |  |  |  |  |  |  |
Dexter Park |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |
Rental income | $ 4,032,707 | 3,866,189 | $ 8,060,966 | 7,760,792 |  |  |  |  |  |
Laundry and Sundry Income | 24,695 | 28,397 | 48,720 | 53,085 |  |  |  |  |  |
Total Revenues | 4,057,402 | 3,894,586 | 8,109,686 | 7,813,877 |  |  |  |  |  |
Expenses |  |  |  |  |  |  |  |  |  |
Administrative | 40,385 | 68,809 | 95,917 | 134,238 |  |  |  |  |  |
Depreciation and amortization | 907,113 | 891,478 | 1,807,214 | 1,765,620 |  |  |  |  |  |
Management Fees | 82,504 | 89,328 | 168,653 | 172,340 |  |  |  |  |  |
Operating | 217,696 | 307,208 | 599,340 | 693,350 |  |  |  |  |  |
Renting | 34,886 | 80,160 | 54,549 | 109,942 |  |  |  |  |  |
Repairs and Maintenance | 307,357 | 333,886 | 563,942 | 646,287 |  |  |  |  |  |
Taxes and Insurance | 517,043 | 415,204 | 1,035,769 | 834,493 |  |  |  |  |  |
Total Expenses | 2,106,984 | 2,186,073 | 4,325,384 | 4,356,270 |  |  |  |  |  |
Income Before Other Income | 1,950,418 | 1,708,513 | 3,784,302 | 3,457,607 |  |  |  |  |  |
Other Income (loss) |  |  |  |  |  |  |  |  |  |
Interest Expense | (1,267,633) | (1,321,805) | (2,537,735) | (2,488,042) |  |  |  |  |  |
Other Income (Expense) |  | (3,829,950) |  | (3,829,950) |  |  |  |  |  |
Total Other Income (Loss) | (1,267,633) | (5,151,755) | (2,537,735) | (6,317,992) |  |  |  |  |  |
Net Income (Loss) | 682,785 | $ (3,443,243) | 1,246,567 | $ (2,860,385) |  |  |  |  |  |
Ownership interest (as a percent) |  | 40.00% |  | 40.00% | 40.00% |  |  |  |  |
Dexter Park | NERA 40% |  |  |  |  |  |  |  |  |  |
Other Income (loss) |  |  |  |  |  |  |  |  |  |
Proportionate share of net income (loss) | $ 273,114 | $ (1,377,297) | $ 498,630 | $ (1,144,154) |  |  |  |  |  |
Ownership interest (as a percent) | 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
Name: | nen_EquityMethodInvestmentSummarizedFinancialInformationDepreciationDepletionAndAmortization
Namespace Prefix: | nen_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of gain (loss), after tax expense or benefit and not previously recognized, resulting from the sale of a business component reported by an equity method investment of the entity. + References No definition available. + Details
Name: | nen_EquityMethodInvestmentSummarizedFinancialInformationDiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
Namespace Prefix: | nen_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line reported by an equity method investment of the entity. + References No definition available. + Details
Name: | nen_EquityMethodInvestmentSummarizedFinancialInformationGeneralAndAdministrativeExpense
Namespace Prefix: | nen_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of the cost of borrowed funds accounted for as interest expense reported by an equity method investment of the entity. + References No definition available. + Details
Name: | nen_EquityMethodInvestmentSummarizedFinancialInformationInterestExpense
Namespace Prefix: | nen_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line reported by an equity method investment of the entity. + References No definition available. + Details
Name: | nen_EquityMethodInvestmentSummarizedFinancialInformationLeaseAndRentalExpense
Namespace Prefix: | nen_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition This element represents the amount of management fee incurred for payment to a management company during the reporting period reported by an equity method investment of the entity. + References No definition available. + Details
Name: | nen_EquityMethodInvestmentSummarizedFinancialInformationManagementFees
Namespace Prefix: | nen_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business) reported by an equity method investment of the entity. + References No definition available. + Details
Name: | nen_EquityMethodInvestmentSummarizedFinancialInformationNonoperatingIncomeExpense
Namespace Prefix: | nen_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | nen_EquityMethodInvestmentSummarizedFinancialInformationNonoperatingIncomeExpenseAbstract
Namespace Prefix: | nen_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services reported by an equity method investment of the entity. Includes selling, general and administrative expense. + References No definition available. + Details
Name: | nen_EquityMethodInvestmentSummarizedFinancialInformationOperatingExpenses
Namespace Prefix: | nen_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | nen_EquityMethodInvestmentSummarizedFinancialInformationOperatingExpensesAbstract
Namespace Prefix: | nen_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The net result for the period of deducting operating expenses from operating revenues reported by an equity method investment of the entity. + References No definition available. + Details
Name: | nen_EquityMethodInvestmentSummarizedFinancialInformationOperatingIncomeLoss
Namespace Prefix: | nen_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The total amount of revenue recognized for the period from operating leases, including minimum lease revenue, contingent revenue, percentage revenue and sublease revenue. + References No definition available. + Details
Name: | nen_EquityMethodInvestmentSummarizedFinancialInformationOperatingLeasesIncomeStatementLeaseRevenue
Namespace Prefix: | nen_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Other costs incurred during the reporting period related to other revenue generating activities reported by an equity method investment of the entity. + References No definition available. + Details
Name: | nen_EquityMethodInvestmentSummarizedFinancialInformationOtherCostOfOperatingRevenue
Namespace Prefix: | nen_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The net amount of other income and expense amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income (expense) reported by an equity method investment of the entity. + References No definition available. + Details
Name: | nen_EquityMethodInvestmentSummarizedFinancialInformationOtherNonoperatingIncomeExpense
Namespace Prefix: | nen_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Other real estate revenue not otherwise specified in the taxonomy. + References No definition available. + Details
Name: | nen_EquityMethodInvestmentSummarizedFinancialInformationOtherRealEstateRevenue
Namespace Prefix: | nen_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The aggregate total of real estate taxes and insurance expense reported by an equity method investment of the entity. + References No definition available. + Details
Name: | nen_EquityMethodInvestmentSummarizedFinancialInformationRealEstateTaxesAndInsurance
Namespace Prefix: | nen_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the share of partner's in net income (loss). + References No definition available. + Details
Name: | nen_NetIncomeLossProportionateShare
Namespace Prefix: | nen_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
Name: | us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_EquityMethodInvestmentSummarizedFinancialInformationIncomeStatementAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of net income (loss) reported by an equity method investment of the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(g)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14064-108612 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721683-107760 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33912-111571 + Details
Name: | us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of revenue from sale of goods and services reduced by sales returns, allowances, and discounts reported by an equity method investment of the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721683-107760 + Details
Name: | us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | nen_PartnershipOwnershipAxis=nen_NewEnglandRealtyAssociatesLimitedPartnership50PercentOwnershipMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | nen_PartnershipOwnershipAxis=nen_NewEnglandRealtyAssociatesLimitedPartnership40PercentOwnershipMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=nen_HamiltonEssex81LLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=nen_HamiltonEssexDevelopmentLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=nen_Franklin345LLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=nen_Hamilton1025LLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=nen_HamiltonBayApartmentsLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=nen_HamiltonMinutemanLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=nen_HamiltonOnMainLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=nen_HamiltonParkTowersLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |