QUARTERLY RESULTS OF OPERATIONS (Details) - USD ($) $ / shares in Units, $ in Thousands	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, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Rents and interest and other income	$ 30,905	$ 31,491	$ 31,302	$ 31,535	$ 29,271	$ 29,776	$ 30,521	$ 28,903	$ 28,621	$ 27,539	$ 23,756	$ 22,304	$ 125,233	$ 118,471	$ 102,220
Total operating expenses	27,606	25,725	25,460	26,337	25,821	25,429	24,751	24,823	29,732	24,613	19,310	19,264	105,128	100,824	92,919
Operating income (loss)	3,299	5,766	5,842	5,198	3,450	4,347	5,770	4,080	(1,111)	2,926	4,446	3,040	20,105	17,647	9,301
Other expenses	(14,729)	(8,967)	(15,613)	(10,658)	(10,364)	(9,309)	(7,901)	(9,054)	(13,243)	(11,211)	(5,243)	(6,398)	(49,967)	(36,628)	(36,095)
Loss before gain on land sales, non-controlling interest, and taxes	(11,430)	(3,201)	(9,771)	(5,460)	(6,914)	(4,962)	(2,131)	(4,974)	(14,354)	(8,285)	(797)	(3,358)	(29,862)	(18,981)	(26,794)
Gain on sale of income-producing properties	1				11,283		5,168	(244)					9,842	16,207
Gain on land sales	4,385	9,841	(476)	445	(805)	555	1,719	1,652	13,788	997	1,250	2,876	4,884	3,121	18,911
Income tax benefit (expense)	(180)					(25)		1	(881)	274	(12)	102	180	24	517
Net income (loss) from continuing operations					3,564	(4,432)	4,756	(3,565)	(1,447)	(7,014)	441	(380)	(15,316)	323	(8,400)
Net income from discontinued operations					(3)			2	220	508	(22)	190		(1)	896
Net income (loss)	(7,224)	7,170	(10,247)	(5,015)	3,561	(4,432)	4,756	(3,563)	(1,227)	(6,506)	419	(190)	(15,316)	322	(7,504)
Net income (loss) attributable to non-controlling interest	(121)	(96)	(163)	(119)	(97)	(114)	(97)	23	(51)	(95)	(281)	295
Preferred dividend requirement	(230)	(224)	(224)	(222)	(227)	(227)	(224)	(222)	(227)	(227)	(224)	(222)
Net income (loss) applicable to common shares	$ (7,575)	$ 6,850	$ (10,634)	$ (5,356)	$ 3,237	$ (4,773)	$ 4,435	$ (3,762)	$ (1,505)	$ (6,828)	$ (86)	$ (117)	$ (16,715)	$ (863)	$ (8,536)
Earnings per share - basic
Net income (loss) from continuing operations (in dollars per share)	$ (.88)	$ 0.79	$ (1.22)	$ (0.61)					$ (0.19)	$ (0.84)	$ (0.01)	$ (0.04)	$ (1.92)	$ (0.10)	$ (1.08)
Net income (loss) from discontinued operations (in dollars per share)									0.02	0.06		0.02			0.1
Net income (loss) applicable to common shares (in dollars per share)	$ (.88)	$ 0.79	$ (1.22)	$ (0.61)	$ 0.37	$ (0.55)	$ 0.51	$ (0.43)	$ (0.17)	$ (0.78)	$ (0.01)	$ (0.02)	$ (1.92)	$ (0.10)	$ (0.98)
Weighted average common shares used in computing earnings per share	8,717,767	8,717,767	8,717,767	8,717,767	8,717,767	8,717,767	8,717,767	8,717,767	8,717,767	8,717,767	8,717,767	8,717,767	8,717,767	8,717,767	8,717,767
Earnings per share - diluted
Net income (loss) from continuing operations (in dollars per share)	$ (.88)	$ 0.79	$ (1.22)	$ (0.61)					$ (0.19)	$ (0.84)	$ (0.01)	$ (0.04)	$ (1.92)	$ (0.10)	$ (1.08)
Net income (loss) from discontinued operations (in dollars per share)									0.02	0.06		0.02			0.1
Net income (loss) applicable to common shares (in dollars per share)	$ (.88)	$ 0.79	$ (1.22)	$ (0.61)	$ 0.37	$ (0.55)	$ 0.51	$ (0.43)	$ (0.17)	$ (0.78)	$ (0.01)	$ (0.02)	$ (1.92)	$ (0.10)	$ (0.98)
Weighted average common shares used in computing diluted earnings per share	8,717,767	8,717,767	8,717,767	8,717,767	8,717,767	8,717,767	8,717,767	8,717,767	8,717,767	8,717,767	8,717,767	8,717,767	8,717,767	8,717,767	8,717,767