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QUARTERLY DATA (Details) - USD ($) $ / shares in Units, $ in Thousands	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, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Total operating expenses	$ 405	$ 339	$ 431	$ 414	$ 358	$ 368	$ 448	$ 414	$ 462	$ 634	$ 374	$ 340	$ 1,589	$ 1,588	$ 1,810
Operating loss	(405)	(339)	(431)	(414)	(358)	(368)	(448)	(414)	(462)	(634)	(374)	(340)	(1,589)	(1,588)	(1,810)
Other income, net of other expenses	2,110	1,302	2,032	1,479	1,673	1,672	1,824	1,642	1,556	1,201	1,081	1,042	6,923	6,811	4,880
Gain on sale of real estate land										7,323
Income before gain on land sales, non-contolling interest, and taxes	1,705	963	1,601	1,065	1,315	1,304	1,376	1,228	1,094	7,890	707	702	5,334	5,223	10,393
Income tax expense	358	202	336	224	257	274	289	258	281	1,902			1,120	1,078	2,183
Net income (loss)	$ 1,347	$ 761	$ 1,265	$ 841	$ 1,058	$ 1,030	$ 1,087	$ 970	$ 813	$ 5,988	$ 707	$ 702	$ 4,214	$ 4,145	$ 8,210
Earnings per share - basic and diluted
Net income (loss) applicable to common shares (in dollars per share)	$ 0.32	$ 0.18	$ 0.30	$ 0.20	$ 0.25	$ 0.25	$ 0.26	$ 0.23	$ 0.19	$ 1.44	$ 0.17	$ 0.17	$ 1.01	$ 0.99	$ 1.97
Weighted average common shares used in computing earnings per share (in shares)	4,168,414	4,168,414	4,168,414	4,168,414	4,168,414	4,168,214	4,168,214	4,168,214	4,168,214	4,168,214	4,168,214	4,168,214	4,168,414	4,168,414	4,168,214

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