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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% |  |  |  |  |  |  |

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
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