RENTAL PROPERTIES (Reconciliation) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Rental Properties
Balance, Beginning	$ 225,021,946	$ 221,454,286	$ 158,624,893
Additions:
Buildings, improvements and other assets	37,895,926	5,604,791	65,349,698
Balance before deductions	262,917,872	227,059,077	223,974,591
Deduct:
Write-offs of retired or disposed assets	1,640,974	2,037,131	2,505,787
Rental properties held for sale and/or sold			14,518
Balance, Ending	261,276,898	225,021,946	221,454,286
Accumulated Depreciation
Balance, Beginning	75,905,862	68,549,625	63,651,293
Add:
Depreciation for the year	10,314,696	9,393,368	7,404,120
Total additions	86,220,558	77,942,993	71,055,413
Deduct:
Accumulated depreciation of retired or disposed assets	1,640,974	2,037,131	2,505,788
Balance, Ending	$ 84,579,584	$ 75,905,862	$ 68,549,625