RENTAL PROPERTIES (Reconciliation) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Rental Properties
Balance, Beginning	$ 337,902,411	$ 311,951,597	$ 263,659,293
Additions:
Buildings, improvements and other assets	62,267,137	38,160,379	50,784,476
Balance before deductions	400,169,548	350,111,976	314,443,769
Deduct:
Write-offs of retired or disposed assets	1,615,548	12,209,565	2,492,172
Balance, Ending	398,554,000	337,902,411	311,951,597
Accumulated Depreciation
Balance, Beginning	107,391,148	104,797,803	94,196,482
Add:
Depreciation for the year	14,414,411	14,802,911	13,093,493
Total additions	121,805,559	119,600,714	107,289,975
Deduct:
Accumulated depreciation of retired or disposed assets	1,615,547	12,209,566	2,492,172
Balance, Ending	$ 120,190,012	$ 107,391,148	$ 104,797,803