Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	[1]	Common Stock	Capital in Excess of Par Value	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	[1]	Treasury Stock	Accumulated Other Comprehensive Income (Loss)
Common stock, par value (in USD per share)	$ 1
Balance at beginning of year (in shares) at Dec. 31, 2018				8,955,930
Balance at beginning of year at Dec. 31, 2018	$ 99,173	$ 1,937		$ 9,006	$ 15,623	$ 77,338	$ 1,937		$ (1,234)	$ (1,560)
Net income	7,221					7,221
Adjustment for foreign currency translation	1,559									1,559
Stock-based compensation	2,638				2,638
Shares issued (in shares)				184,455
Shares issued	$ 0			$ 184	(184)
Shares repurchased held in treasury (in shares)	(32,362)			(96,614)
Shares repurchased held in treasury	$ (4,527)								(4,527)
Balance at end of year (in shares) at Dec. 31, 2019	9,190,171			9,043,771
Balance at end of year at Dec. 31, 2019	$ 108,001			$ 9,190	18,077	86,496			(5,761)	(1)
Common stock, par value (in USD per share)	$ 1
Net income	$ 15,113					15,113
Adjustment for foreign currency translation	700									700
Stock-based compensation	1,847				1,847
Shares issued (in shares)				97,454
Shares issued	$ 15			$ 98	(83)
Shares repurchased held in treasury (in shares)	(47,504)			(80,186)
Shares repurchased held in treasury	$ (3,254)								(3,254)
Balance at end of year (in shares) at Dec. 31, 2020	9,287,625			9,061,039
Balance at end of year at Dec. 31, 2020	$ 122,422			$ 9,288	$ 19,841	$ 101,609			$ (9,015)	$ 699
Common stock, par value (in USD per share)	$ 1

[1] The Company adopted the ASC No.842, Leases (ASC 842) on January 1, 2019 using the modified retrospective approach. See Note 12 - Leases for further details.