RENTAL PROPERTIES (Reconciliation) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Rental Properties
Balance, Beginning	$ 311,951,597	$ 263,659,293	$ 261,276,898
Additions:
Buildings, improvements and other assets	38,160,379	50,784,476	5,163,081
Balance before deductions	350,111,976	314,443,769	266,439,979
Deduct:
Write-offs of retired or disposed assets	12,209,565	2,492,172	2,112,142
Rental properties held for sale and/or sold			668,544
Balance, Ending	337,902,411	311,951,597	263,659,293
Accumulated Depreciation
Balance, Beginning	104,797,803	94,196,482	84,579,584
Add:
Depreciation for the year	14,802,911	13,093,493	11,729,039
Total additions	119,600,714	107,289,975	96,308,623
Deduct:
Accumulated depreciation of retired or disposed assets	12,209,566	2,492,172	2,112,141
Balance, Ending	$ 107,391,148	$ 104,797,803	$ 94,196,482