TAXABLE INCOME AND TAX BASIS (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
TAXABLE INCOME AND TAX BASIS
Excess amount of statement income over taxable income									$ 7,153,000
Excess amount of cumulative statement basis over cumulative taxable basis	$ 7,332,000								7,332,000
Excess amount of statement income from joint venture investments over taxable income									1,476,000
Reconciliation of GAAP net income to taxable income
Financial statement ("book") net income	$ (970,022)	$ (439,284)	$ 1,465,051	$ 1,368,783	$ 1,898,513	$ 1,383,979	$ 1,764,244	$ 1,500,516	1,424,528	$ 6,547,252	$ 4,169,090
Book/Tax differences from depreciation and amortization									5,426,000	(10,177,000)	(4,675,000)
Book/Tax differences on tax free exchanges									1,201,000	1,223,000	1,087,000
Book/Tax differences from Investment Properties									(69,000)	1,624,000	313,000
Increase (Decrease) in prepaid rent and allowances									936,000	1,226,000	234,000
Business interest limitations										1,596,000	3,713,000
Other items									(341,000)
Taxable net income									$ 8,578,000	$ 2,039,000	$ 4,841,000