RENTAL PROPERTIES (Details)	3 Months Ended
	Mar. 31, 2021 USD ($) item property	Dec. 31, 2020 USD ($)	Mar. 31, 2020 property
Rental properties
Total fixed assets	$ 399,263,896	$ 398,629,793
Less: Accumulated depreciation	(137,902,138)	(134,019,906)
Total fixed assets, net	261,361,758	264,609,887
Land, improvements and parking lots
Rental properties
Total fixed assets	$ 86,867,393	86,867,393
Land, improvements and parking lots | Minimum
Rental properties
Useful Life	15 years
Land, improvements and parking lots | Maximum
Rental properties
Useful Life	40 years
Buildings and improvements
Rental properties
Total fixed assets	$ 253,483,082	253,322,865
Buildings and improvements | Minimum
Rental properties
Useful Life	15 years
Buildings and improvements | Maximum
Rental properties
Useful Life	40 years
Kitchen cabinets
Rental properties
Total fixed assets	$ 17,234,223	17,157,121
Kitchen cabinets | Minimum
Rental properties
Useful Life	5 years
Kitchen cabinets | Maximum
Rental properties
Useful Life	10 years
Carpets
Rental properties
Total fixed assets	$ 11,304,573	11,146,634
Carpets | Minimum
Rental properties
Useful Life	5 years
Carpets | Maximum
Rental properties
Useful Life	10 years
Air conditioning
Rental properties
Total fixed assets	$ 501,697	501,697
Air conditioning | Minimum
Rental properties
Useful Life	5 years
Air conditioning | Maximum
Rental properties
Useful Life	10 years
Laundry equipment
Rental properties
Total fixed assets	$ 608,271	608,271
Laundry equipment | Minimum
Rental properties
Useful Life	5 years
Laundry equipment | Maximum
Rental properties
Useful Life	7 years
Elevators
Rental properties
Total fixed assets	$ 1,885,265	1,885,265
Elevators | Minimum
Rental properties
Useful Life	20 years
Elevators | Maximum
Rental properties
Useful Life	40 years
Swimming pools
Rental properties
Total fixed assets	$ 1,092,194	1,092,194
Swimming pools | Minimum
Rental properties
Useful Life	10 years
Swimming pools | Maximum
Rental properties
Useful Life	30 years
Equipment
Rental properties
Total fixed assets	$ 17,750,185	17,596,043
Equipment | Minimum
Rental properties
Useful Life	5 years
Equipment | Maximum
Rental properties
Useful Life	30 years
Motor vehicles
Rental properties
Total fixed assets	$ 211,660	211,660
Motor vehicles | Maximum
Rental properties
Useful Life	5 years
Fences
Rental properties
Total fixed assets	$ 46,871	46,872
Fences | Minimum
Rental properties
Useful Life	5 years
Fences | Maximum
Rental properties
Useful Life	15 years
Furniture and fixtures
Rental properties
Total fixed assets	$ 7,781,841	7,697,137
Furniture and fixtures | Minimum
Rental properties
Useful Life	5 years
Furniture and fixtures | Maximum
Rental properties
Useful Life	7 years
Smoke alarms
Rental properties
Total fixed assets	$ 496,641	$ 496,641
Smoke alarms | Minimum
Rental properties
Useful Life	5 years
Smoke alarms | Maximum
Rental properties
Useful Life	7 years
Wholly owned properties
RENTAL PROPERTIES
Number of properties | item	29
Investment Properties
RENTAL PROPERTIES
Number of units | property	865		865
Investment Properties | Minimum
RENTAL PROPERTIES
Ownership interest (as a percent)	40.00%
Investment Properties | Maximum
RENTAL PROPERTIES
Ownership interest (as a percent)	50.00%
Residential and mixed-use properties
RENTAL PROPERTIES
Number of units | item	2,892
Number of properties | item	25
Residential and mixed-use properties | Partially owned properties
RENTAL PROPERTIES
Number of units | item	688
Number of properties | item	7
Residential and mixed-use properties | Partially owned properties | Minimum
RENTAL PROPERTIES
Ownership interest (as a percent)	40.00%
Residential and mixed-use properties | Partially owned properties | Maximum
RENTAL PROPERTIES
Ownership interest (as a percent)	50.00%
Residential and mixed-use properties | Investment Properties | Partially owned properties
RENTAL PROPERTIES
Number of units | property	688
Condominium
RENTAL PROPERTIES
Number of units | item	19
Condominium | Wholly owned properties
RENTAL PROPERTIES
Number of units | item	19
Number of properties | item	1