Condensed Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balance (in shares) at Dec. 31, 2018	15,202,387
Balance at Dec. 31, 2018	$ 15	$ 55,859	$ 103,032	$ (7,985)	$ 150,921
Common shares issued upon exercise of options, net (in shares)	44,161
Common shares issued upon exercise of options, net		369	(159)		210
Restricted shares issued (in shares)	38,829
Restricted shares issued
Share-based compensation expense		481			481
Cash dividends declared			(1,515)		(1,515)
Tax benefit from vesting of acquisition-related restricted stock		30			30
Shares reacquired and retired (in shares)	(55,602)
Shares reacquired and retired		(203)	(789)		(992)
Net earnings			2,376		2,376
Cash flow hedges, net of taxes				(5)	(5)
Pensions, net of taxes				247	247
Change in currency translation adjustment, net of taxes				(28)	(28)
Balance (in shares) at Mar. 31, 2019	15,229,775
Balance at Mar. 31, 2019	$ 15	56,536	102,945	(7,771)	151,725
Balance (in shares) at Dec. 31, 2018	15,202,387
Balance at Dec. 31, 2018	$ 15	55,859	103,032	(7,985)	150,921
Net earnings					$ 2,376
Balance (in shares) at Dec. 31, 2019	15,227,604				15,227,604
Balance at Dec. 31, 2019	$ 15	57,442	107,581	(7,484)	$ 157,554
Common shares issued upon exercise of options, net (in shares)
Restricted shares issued (in shares)	38,015
Restricted shares issued
Share-based compensation expense		399			399
Cash dividends declared			(1,521)		(1,521)
Tax benefit from vesting of acquisition-related restricted stock		(13)			(13)
Shares reacquired and retired (in shares)	(43,458)
Shares reacquired and retired		(159)	(341)		(500)
Net earnings			3,367		3,367
Cash flow hedges, net of taxes				(5)	(5)
Pensions, net of taxes				348	348
Change in currency translation adjustment, net of taxes				(1,239)	$ (1,239)
Share-based compensation expense (in shares)
Balance (in shares) at Mar. 31, 2020	15,222,161				15,222,161
Balance at Mar. 31, 2020	$ 15	$ 57,669	$ 109,086	$ (8,380)	$ 158,390