TAXABLE INCOME AND TAX BASIS (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
TAXABLE INCOME AND TAX BASIS
Excess amount of taxable income over statement income									$ 530,000
Excess amount of cumulative statement basis over cumulative taxable basis	12,000,000								12,000,000
Excess amount of statement income from joint venture investments over taxable income									1,700,000
Reconciliation of GAAP net income to taxable income
Financial statement ("book") net income (loss)	1,185,131	774,453	1,047,261	626,953	568,257	456,926	8,093,285	172,812	3,633,798	9,291,281	(1,359,232)
Book/Tax differences from depreciation and amortization									51,000	(1,024,000)	(643,000)
Book/Tax differences on tax free exchanges									266,000	(7,707,000)
Book/Tax differences from Investment Properties									198,000	(161,000)	403,000
Increase (Decrease) in prepaid rent and allowances									(40,000)	29,000	(204,000)
Other									57,000	7,000
Taxable income (loss)									$ 4,166,000	$ 435,000	$ (1,803,000)