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INVESTMENT IN UNCONSOLIDATED JOINT VENTURES (Details) |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 12, 2016 USD ($) | Jul. 08, 2016 USD ($) | Sep. 30, 2015 USD ($) | Sep. 28, 2015 USD ($) | Oct. 28, 2009 USD ($) item | Mar. 07, 2005 USD ($) item | Mar. 02, 2005 USD ($) item | Aug. 31, 2014 USD ($) | Jun. 30, 2013 USD ($) | Feb. 28, 2007 USD ($) | Jan. 31, 2007 USD ($) | Oct. 31, 2004 USD ($) | Mar. 31, 2018 USD ($) property item | Mar. 31, 2017 USD ($) item | Dec. 31, 2005 USD ($) | Dec. 31, 2017 USD ($) item | Mar. 01, 2017 USD ($) | Dec. 31, 2006 USD ($) | Oct. 03, 2005 USD ($) item | Sep. 30, 2004 USD ($) item | Aug. 31, 2004 USD ($) item | Nov. 30, 2001 USD ($) item
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of limited partnerships and limited liability companies in which the entity has invested | item |  |  |  |  |  |  |  |  |  |  |  |  | 8 |  |  |  |  |  |  |  |  |
Number of partnerships investing in commercial property | item |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |
Investments in joint venture |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,986,470 | $ 9,955,145 |  | $ 7,212,044 |  |  |  |  |  |
Outstanding amount of mortgage |  |  |  |  |  |  |  |  |  |  |  |  | 253,584,894 |  |  | $ 233,221,258 |  |  |  |  |  |
Number of units | item |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,033 |  |  |  |  |  |  |  |
Number of units retained for long-term investment | item |  |  |  |  |  |  |  |  |  |  |  |  |  | (690) |  |  |  |  |  |  |  |
Number of units sold | item |  |  |  |  |  |  |  |  |  |  |  |  |  | 264 |  |  |  |  |  |  |  |
Interest paid |  |  |  |  |  |  |  |  |  |  |  |  | 3,010,000 | $ 2,472,000 |  |  |  |  |  |  |  |
Units to be sold | item |  |  |  |  |  |  |  |  |  |  |  |  |  | 343 |  |  |  |  |  |  |  |
Distribution to the Partnership |  |  |  |  |  |  |  |  |  |  |  |  | 1,119,481 | $ 1,119,687 |  |  |  |  |  |  |  |
Carrying value of investment to discontinue applying the equity method |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |
Limited Partnerships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of limited partnerships and limited liability companies in which the entity has invested | item |  |  |  |  |  |  |  |  |  |  |  |  | 9 |  |  |  |  |  |  |  |  |
Dexter Park |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as a percent) |  |  |  |  | 40.00% |  |  |  |  |  |  |  |  | 40.00% |  |  |  |  |  |  |  |
Investments in joint venture |  |  |  |  | $ 15,925,000 |  |  |  |  |  |  |  |  | $ 3,300,098 |  |  |  |  |  |  |  |
Number of units | item |  |  |  |  | 409 |  |  |  |  |  |  |  |  | 409 |  |  |  |  |  |  |  |
Number of units retained for long-term investment | item |  |  |  |  |  |  |  |  |  |  |  |  |  | (409) |  |  |  |  |  |  |  |
Purchase price of investments |  |  |  |  | $ 129,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dexter Park | Mortgages payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding amount of mortgage |  |  |  |  |  |  |  |  |  |  |  |  | $ 81,601,000 |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  | 5.57% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period for which the entity is required to make interest only payments |  |  |  |  | 2 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization period of debt |  |  |  |  | 30 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  | $ 89,914,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Hamilton Bay Apts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  | 50.00% |  |  |
Investments in joint venture |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,956,030 |  |  |  |  | $ 2,500,000 |  |  |
Number of units | item |  |  |  |  |  |  |  |  |  |  |  |  |  | 48 |  |  |  |  | 168 |  |  |
Number of units retained for long-term investment | item |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  | 48 |  |  |
Number of units sold | item |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  | 120 |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  | 5.57% |  |  |  |  |  |  |  |  |  |  |  |
Period for which the entity is required to make interest only payments |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |
Amortization period of debt |  |  |  |  |  |  |  |  |  | 30 years |  |  |  |  |  |  |  |  |  |  |  |
Purchase price of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 30,875,000 |  |  |
Borrowings |  |  |  |  |  |  |  |  |  | $ 4,750,000 |  |  |  |  |  |  |  |  |  |  |  |
Units to be sold | item |  |  |  |  |  |  |  |  |  |  |  |  |  | 46 |  |  |  |  |  |  |  |
Hamilton Bay Apts | Mortgages payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding amount of mortgage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,222,000 |  |  |  |  |
Hamilton Bay Sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |
Investments in joint venture |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 79,747 |  |  |  |  |  |  |  |
Number of units | item |  |  |  |  |  |  |  |  |  |  |  |  |  | 120 |  |  |  |  |  |  |  |
Number of units sold | item |  |  |  |  |  |  |  |  |  |  |  |  |  | 120 |  |  |  |  |  |  |  |
Units to be sold | item |  |  |  |  |  |  |  |  |  |  |  |  |  | 120 |  |  |  |  |  |  |  |
Hamilton Essex Development, LLC and Hamilton Essex 81, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as a percent) |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in joint venture |  |  |  |  |  | $ 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price of investments |  |  |  |  |  | 14,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Hamilton Essex Development, LLC and Hamilton Essex 81, LLC | Mortgages payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  | $ 10,750,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Hamilton Essex 81 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |
Number of units | item |  |  |  |  |  | 48 |  |  |  |  |  |  |  | 49 |  |  |  |  |  |  |  |
Number of units retained for long-term investment | item |  |  |  |  |  |  |  |  |  |  |  |  |  | (49) |  |  |  |  |  |  |  |
Capital contributions |  |  |  | $ 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties | item |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution to the Partnership |  |  | $ 978,193 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Hamilton Essex 81 | Mortgages payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding amount of mortgage |  |  |  |  |  |  |  |  |  |  |  |  | $ 10,000,000 |  |  |  |  |  |  |  |  |
Borrowings |  |  | $ 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of debt |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Hamilton Essex 81 | Mortgages payable | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Margin over basis of interest rate (as a percent) |  |  | 2.18% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Hamilton Essex Development |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |
Investments in joint venture |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,336,486 |  |  |  |  |  |  |  |
Number of units | item |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |
Number of units retained for long-term investment | item |  |  |  |  |  |  |  |  |  |  |  |  |  | (1) |  |  |  |  |  |  |  |
Capacity of real estate property (in cars per lot) | item |  |  |  |  |  | 50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital contributions |  |  |  | 978,193 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Hamilton Essex Development | Mortgages payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of loan |  |  |  | $ 1,952,286 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Hamilton 1025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as a percent) |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |
Investments in joint venture |  |  |  |  |  |  | $ 2,352,000 |  |  |  |  |  |  | $ 1,799,349 |  |  |  |  |  |  |  |
Number of units | item |  |  |  |  |  |  | 176 |  |  |  |  |  | 10 | 176 |  |  |  |  |  |  |  |
Number of units retained for long-term investment | item |  |  |  |  |  |  | 49 |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |
Number of units sold | item |  |  |  |  |  |  | 127 |  |  |  |  |  | 8 | 143 |  | 20 |  |  |  |  |  |
Purchase price of investments |  |  |  |  |  |  | $ 23,750,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital contributions |  | $ 2,359,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Units to be sold | item |  |  |  |  |  |  |  |  |  |  |  |  |  | 176 |  |  |  |  |  |  |  |
Hamilton 1025 | Mortgages payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  | 5.67% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period for which the entity is required to make interest only payments |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization period of debt |  |  |  |  |  |  | 30 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  | $ 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of debt |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Hamilton Minuteman |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  | 50.00% |  |
Investments in joint venture |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 70,108 |  |  |  |  |  | $ 5,075,000 |  |
Outstanding amount of mortgage |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,000,000 |  |  |  |  |  |  |  |  |
Number of units | item |  |  |  |  |  |  |  |  |  |  |  |  |  | 42 |  |  |  |  |  | 42 |  |
Number of units retained for long-term investment | item |  |  |  |  |  |  |  |  |  |  |  |  |  | (42) |  |  |  |  |  |  |  |
Purchase price of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10,100,000 |  |
Amount returned to partnership |  |  |  |  |  |  |  |  |  |  |  | $ 3,775,000 |  |  |  |  |  |  |  |  |  |
Cash contribution by the entity towards loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,250,000 |  |  |  |
Hamilton Minuteman | Mortgages payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage amount | $ 6,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) | 3.71% |  |  |  |  |  |  |  |  |  | 5.67% |  |  |  |  |  |  |  |  |  |  |
Period for which the entity is required to make interest only payments | 15 years |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |
Amortization period of debt |  |  |  |  |  |  |  |  |  |  | 30 years |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  | $ 5,500,000 | $ 8,025,000 |  |  |  |  |  |  |  |  |  |
Term of debt |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |
Repayment of loan | $ 5,158,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution to the Partnership | $ 385,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Hamilton on Main Apts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  | 50.00% |
Investments in joint venture |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 413,328 |  |  |  |  |  |  | $ 8,000,000 |
Number of units | item |  |  |  |  |  |  |  |  |  |  |  |  |  | 148 |  |  |  |  |  |  | 280 |
Number of units retained for long-term investment | item |  |  |  |  |  |  |  |  |  |  |  |  |  | (148) |  |  |  |  |  |  |  |
Number of units sold | item |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 137 |
Purchase price of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 56,000,000 |
Hamilton on Main Apartments, LLC | Mortgages payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding amount of mortgage |  |  |  |  |  |  |  |  |  |  |  |  | 16,900,000 |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  | 4.34% |  |  |  |  |  |  | 5.18% |  |  |  |  |  |  |
Period for which the entity is required to make interest only payments |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |
Amortization period of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30 years |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  | $ 16,900,000 |  |  |  |  |  |  | $ 16,825,000 |  |  |  |  |  |  |
Term of debt |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |
Repayment of loan |  |  |  |  |  |  |  | $ 15,205,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost associated with loan extension |  |  |  |  |  |  |  | $ 161,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term excluding period for which interest only payments to be made |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7 years |  |  |  |  |  |  |
Net proceeds after funding escrow accounts and closing costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 16,700,000 |  |  |  |  |  |  |
345 Franklin |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  | 50.00%
Investments in joint venture |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,533,000
Number of units | item |  |  |  |  |  |  |  |  |  |  |  |  |  | 40 |  |  |  |  |  |  |  | 40
Number of units retained for long-term investment | item |  |  |  |  |  |  |  |  |  |  |  |  |  | (40) |  |  |  |  |  |  |  |
Distribution to the Partnership |  |  |  |  |  |  |  |  | $ 1,610,000 |  |  |  |  |  |  |  |  |  |  |  |  |
345 Franklin | Mortgages payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  | 3.87% |  |  |  |  |  |  |  |  |  |  |  |  |
Period for which the entity is required to make interest only payments |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization period of debt |  |  |  |  |  |  |  |  | 30 years |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  | $ 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Term of debt |  |  |  |  |  |  |  |  | 15 years |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of loan |  |  |  |  |  |  |  |  | $ 6,776,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in joint venture |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,986,470 |  |  |  |  |  |  |  |  |
Number of units | property |  |  |  |  |  |  |  |  |  |  |  |  | 1,033 |  |  |  |  |  |  |  |  |
Number of units retained for long-term investment | property |  |  |  |  |  |  |  |  |  |  |  |  | (690) |  |  |  |  |  |  |  |  |
Number of units sold | property |  |  |  |  |  |  |  |  |  |  |  |  | 205 |  |  |  |  |  |  |  |  |
Units to be sold | property |  |  |  |  |  |  |  |  |  |  |  |  | 343 |  |  |  |  |  |  |  |  |
Residential buildings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of units | item |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,030 |  |  |  |  |  |  |  |
Residential buildings | Dexter Park |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of units | item |  |  |  |  |  |  |  |  |  |  |  |  |  | 409 |  |  |  |  |  |  |  |
Residential buildings | Hamilton Bay Apts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of units | item |  |  |  |  |  |  |  |  |  |  |  |  |  | 48 |  |  |  |  |  |  |  |
Residential buildings | Hamilton Bay Sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of units | item |  |  |  |  |  |  |  |  |  |  |  |  |  | 120 |  |  |  |  |  |  |  |
Residential buildings | Hamilton Essex 81 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of units | item |  |  |  |  |  |  |  |  |  |  |  |  |  | 48 |  |  |  |  |  |  |  |
Residential buildings | Hamilton 1025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of units | item |  |  |  |  |  |  |  |  |  |  |  |  |  | 175 |  |  |  |  |  |  |  |
Residential buildings | Hamilton Minuteman |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of units | item |  |  |  |  |  |  |  |  |  |  |  |  |  | 42 |  |  |  |  |  |  |  |
Residential buildings | Hamilton on Main Apts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of units | item |  |  |  |  |  |  |  |  |  |  |  |  |  | 148 |  |  |  |  |  |  |  |
Residential buildings | 345 Franklin |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of units | item |  |  |  |  |  |  |  |  |  |  |  |  |  | 40 |  |  |  |  |  |  |  |
Residential buildings | Investment Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of units | property |  |  |  |  |  |  |  |  |  |  |  |  | 1,030 |  |  |  |  |  |  |  |  |
Commercial |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of units | item |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |
Commercial | Hamilton Essex 81 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of units | item |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |
Commercial | Hamilton Essex Development |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of units | item |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |
Commercial | Hamilton 1025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of units | item |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |
Commercial | Investment Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of units | property |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |
Management Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of employees having ownership interest in the investment properties | item |  |  |  |  |  |  |  |  |  |  |  |  | 6 |  |  |  |  |  |  |  |  |
Minimum | Mortgages payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  | 3.61% |  |  |  |  |  |  |  |  |
Minimum | Limited Partnerships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  | 40.00% |  |  |  |  |  |  |  |  |
Minimum | Harold Brown |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  | 43.20% |  |  |  |  |  |  |  |  |
Maximum | Mortgages payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  | 5.81% |  |  |  |  |  |  |  |  |
Maximum | Limited Partnerships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |
Maximum | Harold Brown |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  | 56.00% |  |  |  |  |  |  |  |  |

X
- Definition Represents the capacity of real estate property. + References No definition available. + Details
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- Definition Represents the amortization period of mortgage loan principal payments following any initial period requiring only interest payments. + References No definition available. + Details
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- Definition Represents the cash contribution by the entity towards the debt. + References No definition available. + Details
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- Definition Represents the cost associated with the extension of mortgage loan. + References No definition available. + Details
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- Definition Represents the term excluding period for which interest only payments are to be made. + References No definition available. + Details
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- Definition Represents the period for which the entity is required to make interest only payments on the debt instrument. + References No definition available. + Details
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- Definition Represents the carrying value of investment as of the balance sheet date to discontinue applying the equity method. + References No definition available. + Details
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- Definition Represents the number of limited partnerships and limited liability companies in which the entity has made investments which are accounted for using the equity method of consolidation. + References No definition available. + Details
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- Definition Number of employees, excluding President, having ownership interest in the investment properties. + References No definition available. + Details
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Namespace Prefix: | nen_
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- Definition Represents the number of partnerships which are investing in commercial properties. + References No definition available. + Details
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- Definition Represents the number of units retained for long-term investment. + References No definition available. + Details
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- Definition Represents the number of units sold. + References No definition available. + Details
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Balance Type: | na
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- Definition Represents the number of units to be sold. + References No definition available. + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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Data Type: | num:percentItemType
Balance Type: | na
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition This element represents the aggregate cost of investments accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571 + Details
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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66022249&loc=d3e33749-111570 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of cash paid for interest. Includes, but is not limited to, payment to settle zero-coupon bond attributable to accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4297-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585 + Details
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- Definition The number of real estate properties owned as of the balance sheet date. + References No definition available. + Details
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- Definition The number of units in a real estate property owned as of the balance sheet date. + References No definition available. + Details
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- Definition Total contributions made by each class of partners (i.e., general, limited and preferred partners). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 4.F) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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