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RELATED PARTY TRANSACTIONS (Details)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
item
Sep. 30, 2020
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
RELATED PARTY TRANSACTIONS            
Management fee as percentage of gross receipts rental revenue     4.00%      
Management fee as a percentage of gross receipts rental revenue of Linewt, LLC     3.00%      
Management fees of related party     $ 1,868,000 $ 1,863,000    
Management fee $ 646,059 $ 598,111 1,867,798 1,862,645    
Repairs and maintenance 3,128,369 2,524,050 7,432,860 6,659,443    
Administrative expense 607,478 511,812 1,819,481 1,608,664    
Employer contributions in 401K plan     $ 33,000      
Number of limited partnerships and limited liability companies in which the entity has invested | item     7      
Interest expense 3,393,518 3,417,348 $ 10,136,630 10,291,255    
Investment Properties            
RELATED PARTY TRANSACTIONS            
Management fee 156,796 136,989 413,328 458,162    
Repairs and maintenance 884,014 833,173 2,263,838 1,730,992    
Administrative expense 109,128 74,345 $ 318,532 244,308    
Number of limited partnerships and limited liability companies in which the entity has invested | item     7      
Interest expense $ 1,665,791 $ 1,675,322 $ 4,993,153 5,071,896    
Investment Properties | Minimum            
RELATED PARTY TRANSACTIONS            
Ownership interest (as a percent) 40.00%   40.00%      
Investment Properties | Maximum            
RELATED PARTY TRANSACTIONS            
Ownership interest (as a percent) 50.00%   50.00%      
Hamilton Company/Management Company            
RELATED PARTY TRANSACTIONS            
Number of employees having ownership interest in the investment properties | item     5      
Dexter Park            
RELATED PARTY TRANSACTIONS            
Management fee as percentage of gross receipts rental revenue     2.00%      
Harold Brown | Minimum            
RELATED PARTY TRANSACTIONS            
Ownership interest (as a percent) 47.60%   47.60%      
Harold Brown | Maximum            
RELATED PARTY TRANSACTIONS            
Ownership interest (as a percent) 59.00%   59.00%      
General Partner or Management Company [Member]            
RELATED PARTY TRANSACTIONS            
Repairs and maintenance     $ 177,000      
Administrative expense     177,000      
Expenses for construction, architectural services and supervision of capital projects     413,000      
Costs related to professional services     766,000 816,000    
Management Company [Member]            
RELATED PARTY TRANSACTIONS            
Reimbursement to related party for payroll transfers     2,759,000 2,571,000    
Employer contributions in 401K plan     $ 33,000 33,000    
Number of accounting staff of related party providing bookkeeping and accounting functions | item     14      
Fees for accounting and bookkeeping services     $ 93,750 $ 93,750 $ 125,000 $ 125,000
Number of employees having ownership interest in the investment properties | item     5      
Partially owned properties            
RELATED PARTY TRANSACTIONS            
Management fee as percentage of gross receipts rental revenue     4.00%      
Management fee     $ 413,000      
Repairs and maintenance     30,000      
Administrative expense     18,000      
Construction, architectural services and supervision of capital projects     33,000      
Amount paid to related party     $ 494,000      
Residential and mixed-use properties | Partially owned properties | Minimum            
RELATED PARTY TRANSACTIONS            
Ownership interest (as a percent) 40.00%   40.00%      
Residential and mixed-use properties | Partially owned properties | Maximum            
RELATED PARTY TRANSACTIONS            
Ownership interest (as a percent) 50.00%   50.00%