QUARTERLY DATA (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended												12 Months Ended
	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, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Total operating expenses	$ 289	$ 343	$ 342	$ 318	$ 320	$ 345	$ 352	$ 401	$ 385	$ 380	$ 363	$ 390	$ 1,292	$ 1,418	$ 1,518
Net operating loss	(289)	(343)	(342)	(318)	(320)	(345)	(352)	(401)	(385)	(380)	(363)	(390)	(1,292)	(1,418)	(1,518)
Other income, net of other expenses	1,103	1,095	1,085	1,211	789	1,025	955	955	1,013	1,003	1,058	949	4,494	3,724	4,023
Income before taxes	814	752	743	893	469	680	603	554	628	623	695	559	3,202	2,306	2,505
Income tax expense	(1,096)	(25)			(807)				(946)				(1,121)	(807)	(946)
Net income (loss)	$ (282)	$ 727	$ 743	$ 893	$ (338)	$ 680	$ 603	$ 554	$ (318)	$ 623	$ 695	$ 559	$ 2,081	$ 1,499	$ 1,559
Earnings per share - basic and diluted
Net income (loss)	$ (0.07)	$ 0.17	$ 0.18	$ 0.21	$ (0.08)	$ 0.16	$ 0.14	$ 0.13	$ (0.08)	$ 0.15	$ 0.17	$ 0.13	$ 0.50	$ 0.36	$ 0.37
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