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MORTGAGE NOTES PAYABLE (Line of Credit) (Details) |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 04, 2018 USD ($) | Mar. 29, 2018 USD ($) | Sep. 30, 2015 | Jul. 31, 2014 USD ($) item | Jul. 31, 2018 USD ($) | Aug. 31, 2014 | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2005 | Oct. 31, 2018 USD ($) | Sep. 29, 2017 USD ($) | Jul. 06, 2017 USD ($) | Mar. 07, 2005 item
Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  | $ 3,090,471 | $ 3,046,818 | $ 9,331,023 | $ 8,113,197 |  |  |  |  |  |
Payment on line of credit |  |  |  |  |  |  |  |  | 12,000,000 | $ 16,000,000 |  |  |  |  |  |
Credit line balance |  |  |  |  |  |  | 5,000,000 |  | 5,000,000 |  | $ 17,000,000 |  |  |  |  |
Line Of Credit Facility Unused Capacity Commitment Fee |  |  |  |  |  |  |  |  | 15,000 |  |  |  |  |  |  |
Woodland Park Apartments LLC Newton Massachusetts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 22,250,000 | $ 16,000,000 |
Credit line balance |  |  |  |  |  |  |  |  |  |  | 17,000,000 |  |  |  | $ 25,000,000 |
Webster Green Apartments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan amount |  | $ 21,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit line balance |  | 8,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Hamilton Essex 81 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties in which borrowing amount collateralized | item |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tangible net worth |  |  |  |  |  |  | 150,000,000 |  | $ 150,000,000 |  |  |  |  |  |  |
Ratio of net operating income to total indebtedness |  |  |  |  |  |  |  |  | 9.50% |  |  |  |  |  |  |
Debt service coverage ratio |  |  |  |  |  |  |  |  | 1.6 |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Leverage ratio |  |  |  |  |  |  |  |  | 65.00% |  |  |  |  |  |  |
Aggregate increase in indebtedness |  |  |  |  |  |  |  |  | $ 15,000,000 |  |  |  |  |  |  |
Mortgages payable | Hamilton Essex 81 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of debt |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgages payable | Hamilton on Main Apartments, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of debt |  |  |  |  |  | 10 years |  |  |  |  |  | 10 years |  |  |  |
Mortgages payable | LIBOR | Hamilton Essex 81 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Margin over basis of interest rate (as a percent) |  |  | 2.18% |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowings |  |  |  | $ 25,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Term of debt |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |
Amount of refinancing costs |  |  |  |  |  |  |  |  |  |  | 128,000 |  |  |  |  |
Number of properties in which borrowing amount collateralized | item |  |  |  | 23 |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit | Woodland Park Apartments LLC Newton Massachusetts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment on line of credit |  |  |  |  |  |  |  |  |  |  | 8,000,000 |  |  |  |  |
Credit line balance |  |  |  |  |  |  |  |  |  |  | 17,000,000 |  |  |  |  |
Funds drawn by the company |  |  |  |  |  |  |  |  |  |  | $ 25,000,000 |  |  |  |  |
Line of Credit | Webster Green Apartments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment on line of credit | $ 16,000,000 | $ 8,000,000 |  |  | $ 4,000,000 |  |  |  |  |  |  |  |  |  |  |
Credit line balance |  |  |  |  |  |  | $ 5,000,000 |  | $ 5,000,000 |  |  |  |  |  |  |
Line of Credit | Webster Green Apartments | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,000,000 |  |  |
Line of Credit | Federal Funds Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis of effective interest rate used in calculation of Base Rate (as a percent) |  |  |  | 0.50% |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis of effective interest rate used in calculation of Base Rate (as a percent) |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |
Margin over basis of interest rate (as a percent) |  |  |  | 2.50% |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pledged interests of the Partnership's ownership interest (as a percent) |  |  |  | 49.00% |  |  |  |  |  |  |  |  |  |  |  |
Commitment fee for unused amount (as a percent) |  |  |  | 0.15% |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pledged interests of the Partnership's ownership interest (as a percent) |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Commitment fee for unused amount (as a percent) |  |  |  | 0.20% |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Represents the ratio of consolidated adjusted earnings before interest, taxes, depreciation and amortization to interest expense, which is necessary to be maintained under the terms of the senior credit facilities' covenants. + References No definition available. + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition The cash outflow for the settlement of obligation drawn from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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