Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Common Stock Shares Outstanding, Net of Shares of Treasury Stock [Member]	Additional Paid in Capital [Member]	Accumulated Deficit [Member]	Accumulated Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Total
Balance at Dec. 31, 2018	$ 14	$ 59,471	$ 4,533	$ (24)	$ (47,490)	$ 16,504
Balance, shares at Dec. 31, 2018	11,549,519
Cash dividends			(2,893)			(2,893)
Unrealized gain on marketable debt securities, net of realized losses, net of taxes				22		22
Stock-based compensation		744				744
Stock-based compensation, shares	24,074
Net loss			(3,146)			(3,146)
Balance at Dec. 31, 2019	$ 14	60,215	(1,506)	(2)	(47,490)	11,231
Balance, shares at Dec. 31, 2019	11,573,593
Cash dividends
Unrealized gain on marketable debt securities, net of realized losses, net of taxes				(9)		(9)
Stock-based compensation		1,459				1,459
Stock-based compensation, shares	30,660
Net loss			(2,125)			(2,125)
Balance at Dec. 31, 2020	$ 14	$ 61,674	$ (3,631)	$ (11)	$ (47,490)	$ 10,556
Balance, shares at Dec. 31, 2020	11,604,253