Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Treasury Stock [Member]	Total
BALANCE (in shares) at Dec. 31, 2019	0	12,979,414				(1,556,875)
Balance at Dec. 31, 2019	$ 0	$ 13	$ 86,102	$ 16,117	$ (1,264)	$ (25,904)	$ 75,064
Net income (loss)	0	0	0	(573)	0	0	(573)
Dividends declared	0	0	0	(2,285)	0	0	(2,285)
Foreign currency translation adjustments	0	0	0	0	(222)	0	(222)
Unrealized losses on available-for-sale securities	$ 0	$ 0	0	0	(87)	$ 0	(87)
BALANCE (in shares) at Mar. 31, 2020	0	12,979,414				(1,556,875)
Balance at Mar. 31, 2020	$ 0	$ 13	86,102	13,259	(1,573)	$ (25,904)	71,897
BALANCE (in shares) at Dec. 31, 2020	0	12,979,414				(1,556,875)
Balance at Dec. 31, 2020	$ 0	$ 13	86,102	7,822	(336)	$ (25,904)	67,697
Net income (loss)	0	0	0	153	0	0	153
Dividends declared	0	0	0	(2,285)	0	0	(2,285)
Foreign currency translation adjustments	0	0	0	0	(182)	0	(182)
Unrealized losses on available-for-sale securities	$ 0	$ 0	0	0	(7)	$ 0	(7)
BALANCE (in shares) at Mar. 31, 2021	0	12,979,414				(1,556,875)
Balance at Mar. 31, 2021	$ 0	$ 13	$ 86,102	$ 5,690	$ (525)	$ (25,904)	$ 65,376