TAXABLE INCOME AND TAX BASIS (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
TAXABLE INCOME AND TAX BASIS
Taxable net income									$ 5,438,000
Excess amount of statement income over taxable income									1,500,000
Excess amount of cumulative statement basis over cumulative taxable basis	$ 1,532,000								1,532,000
Excess amount of statement income from joint venture investments over taxable income									5,000,000
Reconciliation of GAAP net income to taxable income
Financial statement ("book") net income	$ 1,688,270	$ 871,720	$ 2,483,707	$ 1,894,234	$ 1,528,755	$ 1,210,747	$ 980,586	$ 1,230,764	6,937,931	$ 4,950,852	$ 3,772,565
Book/Tax differences from depreciation and amortization									(3,097,000)	(1,411,000)	(2,513,000)
Book/Tax differences on tax free exchanges									(1,344,000)	(1,257,000)	(501,000)
Book/Tax differences from Investment Properties										279,000	74,000
Increase (Decrease) in prepaid rent and allowances									253,000	375,000	413,000
Other											6,000
Taxable income (loss)									$ 5,438,000	$ 4,893,000	$ 2,106,000