TAXABLE INCOME AND TAX BASIS (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
TAXABLE INCOME AND TAX BASIS
Excess amount of statement income over taxable income									$ 57,000
Book/Tax differences on tax free exchanges									(1,257,000)	$ (501,000)	$ 827,000
Book/Tax differences from depreciation and amortization									1,411,000	2,513,000	2,884,000
Excess amount of cumulative statement basis over cumulative taxable basis	$ 7,200,000								7,200,000
Excess amount of statement income from joint venture investments over taxable income									2,100,000
Reconciliation of GAAP net income to taxable income
Financial statement ("book") net income	$ 1,528,755	$ 1,210,747	$ 980,586	$ 1,230,764	$ 1,192,704	$ 1,073,746	$ 1,096,457	$ 409,658	4,950,852	3,772,565	1,024,850
Book/Tax differences from depreciation and amortization									(1,411,000)	(2,513,000)	(2,884,000)
Book/Tax differences on tax free exchanges									(1,257,000)	(501,000)	827,000
Book/Tax differences from Investment Properties									279,000	74,000	(307,000)
Increase (Decrease) in prepaid rent and allowances									375,000	413,000	269,000
Other										6,000	2,000
Taxable income (loss)									$ 4,893,000	$ 2,106,000	$ (2,108,000)