Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Common Stock	In treasury	Paid-In Capital	Retained Earnings	Total
Beginning Balance, shares at Dec. 31, 2019	17,274
Beginning Balance, Treasury stock shares at Dec. 31, 2019		(1,564)
Beginning Balance, value at Dec. 31, 2019	$ 6,509	$ (12,601)	$ 2,380	$ 46,963	$ 43,251
Issuance of common stock in connection with stock-based compensation, shares		27
Issuance of common stock in connection with stock-based compensation, value		$ 210	306		516
Treasury stock purchased, shares		(179)
Treasury stock purchased, value		$ (405)			(405)
Stock-based compensation			62		62
Net income				146	146
Ending Balance, shares at Mar. 31, 2020	17,274
Ending Balance, Treasury stock shares at Mar. 31, 2020		(1,716)
Ending Balance, value at Mar. 31, 2020	$ 6,509	$ (12,796)	2,748	47,109	43,570
Beginning Balance, shares at Dec. 31, 2020	17,274
Beginning Balance, Treasury stock shares at Dec. 31, 2020		(1,669)
Beginning Balance, value at Dec. 31, 2020	$ 6,509	$ (12,450)	2,600	50,195	46,854
Stock-based compensation			64		64
Net income				1,306	1,306
Ending Balance, shares at Mar. 31, 2021	17,274
Ending Balance, Treasury stock shares at Mar. 31, 2021		(1,669)
Ending Balance, value at Mar. 31, 2021	$ 6,509,000	$ (12,450)	$ 2,664	$ 51,501	$ 48,224