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RELATED PARTY TRANSACTIONS (Details) | 12 Months Ended
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Dec. 31, 2021 USD ($) item | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
RELATED PARTY TRANSACTIONS |  |  |
Management fee | $ 2,523,943 | $ 2,452,814 | $ 2,409,151
Repairs and maintenance | 10,069,325 | 8,781,789 | 9,191,561
Administrative expense | 2,476,593 | 2,209,780 | 2,495,272
Employer contributions in 401K plan | $ 45,000 | 45,000 |
Number of advisory committee meetings | item | 4 |  |
Expenses incurred for advisory committee meeting | $ 25,000 |  |
Number of audit committee meetings held | item | 4 |  |
Expenses incurred for audit committee meeting | $ 32,000 |  |
Interest expense | 13,629,463 | 13,705,415 | 12,201,966
Amount paid to related party | $ 168,000 | 25,000 | 86,000
Majority of Partnership Properties, Excluding Linewt |  |  |
RELATED PARTY TRANSACTIONS |  |  |
Management fee as percentage of gross receipts rental revenue | 4.00% |  |
Hamilton Linewt LLC Commercial-1031 Exchange Newton, Massachusetts |  |  |
RELATED PARTY TRANSACTIONS |  |  |
Management fee as percentage of gross receipts rental revenue | 3.00% |  |
Investment Properties |  |  |
RELATED PARTY TRANSACTIONS |  |  |
Management fee | $ 575,162 | 580,029 | 664,341
Repairs and maintenance | 2,849,104 | 2,441,880 | 2,511,741
Administrative expense | $ 403,509 | 327,697 | 377,298
Number of limited partnerships and limited liability companies in which the entity has invested | item | 7 |  |
Interest expense | $ 6,658,595 | 6,742,727 | 6,915,193
Investment Properties | Minimum |  |  |
RELATED PARTY TRANSACTIONS |  |  |
Ownership interest (as a percent) | 40.00% |  |
Investment Properties | Maximum |  |  |
RELATED PARTY TRANSACTIONS |  |  |
Ownership interest (as a percent) | 50.00% |  |
Hamilton Company/Management Company |  |  |
RELATED PARTY TRANSACTIONS |  |  |
Number of accounting staff of related party providing bookkeeping and accounting functions | item | 14 |  |
Number of employees having ownership interest in the investment properties | item | 5 |  |
Hamilton Company/Management Company, Related Party |  |  |
RELATED PARTY TRANSACTIONS |  |  |
Management fee | $ 2,524,000 | 2,453,000 | 2,409,000
Related Party Transaction, Services, Excluding Management Fee | 1,086,000 | 1,080,000 | 1,702,000
Repairs and maintenance | 220,000 |  |
Administrative expense | 285,000 |  |
Construction, architectural services and supervision of capital projects | 581,000 |  |
Reimbursement to related party for payroll transfers | 3,640,000 | 3,535,000 | 3,384,000
Employer contributions in 401K plan | 45,000 | 45,000 | 45,000
Fees for accounting and bookkeeping services | 125,000 | $ 125,000 | $ 125,000
Investment Properties | Hamilton Company/Management Company |  |  |
RELATED PARTY TRANSACTIONS |  |  |
Property Management Fee Revenue And Other Service Revenue | 692,000 |  |
Amount received for management fees | 575,000 |  |
Amount received for construction, architectural services and supervision of capital projects | 55,000 |  |
Amount received for maintenance services | 34,000 |  |
Amount received for administrative services | $ 28,000 |  |
Number of employees having ownership interest in the investment properties | item | 5 |  |
Investment Properties, Excluding Dexter Park | Hamilton Company/Management Company |  |  |
RELATED PARTY TRANSACTIONS |  |  |
Property management fee received (as a percent) | 4.00% |  |
Dexter Park | Hamilton Company/Management Company |  |  |
RELATED PARTY TRANSACTIONS |  |  |
Property management fee received (as a percent) | 2.00% |  |
Harold Brown | Investment Properties | Minimum |  |  |
RELATED PARTY TRANSACTIONS |  |  |
Ownership interest of related party (as a percent) | 47.60% |  |
Harold Brown | Investment Properties | Maximum |  |  |
RELATED PARTY TRANSACTIONS |  |  |
Ownership interest of related party (as a percent) | 59.00% | 59.00% |
Residential and mixed-use properties | Partially owned properties | Minimum |  |  |
RELATED PARTY TRANSACTIONS |  |  |
Ownership interest (as a percent) | 40.00% |  |
Residential and mixed-use properties | Partially owned properties | Investment Properties | Minimum |  |  |
RELATED PARTY TRANSACTIONS |  |  |
Ownership interest (as a percent) | 40.00% |  |
Residential and mixed-use properties | Partially owned properties | Investment Properties | Maximum |  |  |
RELATED PARTY TRANSACTIONS |  |  |
Ownership interest (as a percent) | 50.00% |  |

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