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SIGNIFICANT ACCOUNTING POLICIES (Details) |  | 12 Months Ended
--- | --- | ---
Jan. 03, 2012 | Jan. 03, 2012 | Dec. 31, 2020 USD ($) item shares | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) tenant | Dec. 31, 2017 USD ($) tenant | Dec. 31, 2016 USD ($) tenant
Principles of Consolidation |  |  |  |  |  |  |
Value at which partnership investments discontinue use of equity method |  |  | $ 0 |  |  |  |
Amount of legal obligations related to investments no longer classified as equity method |  |  | $ 0 |  |  |  |
Revenue Recognition |  |  |  |  |  |  |
Period for which arrears are charged against income |  |  | 60 days |  |  |  |
Deferred Financing Costs |  |  |  |  |  |  |
Amortization of deferred financing costs |  |  | $ 240,000 | $ 338,000 | $ 216,000 |  |
Income Taxes |  |  |  |  |  |  |
Provision for income taxes |  |  | $ 0 |  |  |  |
Segment Reporting |  |  |  |  |  |  |
Number of segments | item |  |  | 1 |  |  |  |
Income Per Unit |  |  |  |  |  |  |
Dilutive units | shares |  |  | 0 |  |  |  |
Concentration of Credit Risks and Financial Instruments |  |  |  |  |  |  |
Single tenants | tenant |  |  |  |  | 0 | 0 | 0
Federally uninsured amounts of cash and cash equivalents, and security deposits included in prepaid expenses and other assets |  |  | $ 18,830,000 | 7,407,000 |  |  |
Advertising Expense |  |  |  |  |  |  |
Advertising expense |  |  | $ 332,325 | $ 281,950 | $ 226,523 |  |
Interest Capitalized |  |  |  |  |  |  |
Capitalized interest |  |  |  |  | $ 0 | $ 0 | $ 0
Minimum |  |  |  |  |  |  |
Interest Capitalized |  |  |  |  |  |  |
Criteria of capitalization of interest on property based on specified period of construction |  |  | 1 year |  |  |  |
Minimum | Cash and cash equivalents |  |  |  |  |  |  |
Concentration of Credit Risks and Financial Instruments |  |  |  |  |  |  |
Interest rate on interest bearing accounts (as a percent) |  |  | 0.0001% |  |  |  |
Maximum | Cash and cash equivalents |  |  |  |  |  |  |
Concentration of Credit Risks and Financial Instruments |  |  |  |  |  |  |
Interest rate on interest bearing accounts (as a percent) |  |  | 0.0003% |  |  |  |
Less Than Wholly Owned Subsidiaries [Member] | Minimum |  |  |  |  |  |  |
Principles of Consolidation |  |  |  |  |  |  |
Ownership interest in each subsidiary (as a percent) |  |  | 99.67% |  |  |  |
Less Than Wholly Owned Subsidiaries [Member] | Maximum |  |  |  |  |  |  |
Principles of Consolidation |  |  |  |  |  |  |
Ownership interest in each subsidiary (as a percent) |  |  | 100.00% |  |  |  |
Investment Properties |  |  |  |  |  |  |
Principles of Consolidation |  |  |  |  |  |  |
Number of limited liability companies/partnerships | item |  |  | 7 |  |  |  |
Investment Properties | Minimum |  |  |  |  |  |  |
Principles of Consolidation |  |  |  |  |  |  |
Percentage of ownership interest |  |  | 40.00% |  |  |  |
Investment Properties | Maximum |  |  |  |  |  |  |
Principles of Consolidation |  |  |  |  |  |  |
Percentage of ownership interest |  |  | 50.00% |  |  |  |
Class A |  |  |  |  |  |  |
Income (Loss) Per Depositary Receipt |  |  |  |  |  |  |
Forward split of depositary receipts | 3 | 3 |  |  |  |  |
Exchange ratio of depositary receipts for partnership units before adjustment | 10 | 10 |  |  |  |  |
Exchange ratio of depositary receipts for partnership units after adjustment | 30 | 30 |  |  |  |  |
Number of units in each depository receipt | 0.03333 | 0.03333 |  |  |  |  |

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