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QUARTERLY DATA (Details) - USD ($) $ / shares in Units, $ in Thousands	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, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Total operating expenses	$ 462	$ 634	$ 374	$ 340	$ 324	$ 312	$ 360	$ 352	$ 289	$ 343	$ 342	$ 318	$ 1,810	$ 1,348	$ 1,292
Operating loss	(462)	(634)	(374)	(340)	(324)	(312)	(360)	(352)	(289)	(343)	(342)	(318)	(1,810)	(1,348)	(1,292)
Other income, net of other expenses	1,556	1,201	1,081	1,042	1,105	924	1,369	1,089	1,103	1,095	1,085	1,211	4,880	4,487	4,494
Gain on sale of real estate land		7,323
Income before gain on land sales, non-contolling interest, and taxes	1,094	7,890	707	702	781	612	1,009	737	814	752	743	893	10,393	3,139	3,202
Income tax expense	(281)	(1,902)			(1,631)				(1,096)	(25)			(2,183)	(1,631)	(1,121)
Net income (loss)	$ 813	$ 5,988	$ 707	$ 702	$ (850)	$ 612	$ 1,009	$ 737	$ (282)	$ 727	$ 743	$ 893	$ 8,210	$ 1,508	$ 2,081
Earnings per share - basic and diluted
Net income (loss) applicable to common shares (in dollars per share)	$ 0.19	$ 1.44	$ 0.17	$ 0.17	$ (0.20)	$ 0.15	$ 0.24	$ 0.18	$ (0.07)	$ 0.17	$ 0.18	$ 0.21	$ 1.97	$ 0.36	$ 0.5
Weighted average common shares used in computing earnings per share (in shares)	4,168,214	4,168,214	4,168,214	4,168,214	4,168,214	4,168,214	4,168,214	4,168,214	4,168,214	4,168,214	4,168,214	4,168,214	4,168,214	4,168,214	4,168,214

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