Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Common Stock	In treasury	Paid-In Capital	Retained Earnings	Total
Beginning Balance, shares at Dec. 31, 2018	17,274
Beginning Balance, Treasury stock shares at Dec. 31, 2018		(1,460)
Beginning Balance, value at Dec. 31, 2018	$ 6,509	$ (12,970)	$ 2,303	$ 46,563	$ 42,405
Cumulative impact of change in accounting principles, net of tax				(53)	(53)
Issuance of common stock in connection with stock-based compensation, shares		107
Issuance of common stock in connection with stock-based compensation, value		$ 907	(438)		469
Treasury stock purchased, shares		(211)
Treasury stock purchased, value		$ (538)			(538)
Stock-based compensation			515		515
Net income				453	453
Ending Balance, shares at Dec. 31, 2019	17,274
Ending Balance, Treasury stock shares at Dec. 31, 2019		(1,564)
Ending 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		74
Issuance of common stock in connection with stock-based compensation, value		$ 556	(62)		494
Treasury stock purchased, shares		(179)
Treasury stock purchased, value		$ (405)			(405)
Stock-based compensation			282		282
Net income				3,232	3,232
Ending Balance, shares at Dec. 31, 2020	17,274
Ending Balance, Treasury stock shares at Dec. 31, 2020		(1,669)
Ending Balance, value at Dec. 31, 2020	$ 6,509	$ (12,450)	$ 2,600	$ 50,195	$ 46,854