TAXABLE INCOME AND TAX BASIS (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
TAXABLE INCOME AND TAX BASIS
Taxable net income									$ 4,841,000
Excess amount of statement income over taxable income									672,000
Excess amount of cumulative statement basis over cumulative taxable basis	$ 878,000								878,000
Excess amount of statement income from joint venture investments over taxable income									1,121,000
Reconciliation of GAAP net income to taxable income
Financial statement ("book") net income	$ 1,576,877	$ 660,329	$ 53,326	$ 1,878,558	$ 1,688,270	$ 871,720	$ 2,483,707	$ 1,894,234	4,169,090	$ 6,937,931	$ 4,950,852
Book/Tax differences from depreciation and amortization									(4,675,000)	(3,097,000)	(1,411,000)
Book/Tax differences on tax free exchanges									(1,087,000)	(1,344,000)	(1,257,000)
Book/Tax differences from Investment Properties									(313,000)		279,000
Increase (Decrease) in prepaid rent and allowances									234,000	253,000	375,000
Other									3,713,000
Taxable income (loss)									$ 4,841,000	$ 5,438,000	$ 4,893,000