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, 2017	15,081,947
Balance at Dec. 31, 2017	$ 15	$ 49,103	$ 83,129	$ (7,279)	$ 124,968
ASC 606 adjustment to opening retained earnings			11,245		11,245
Common shares issued upon exercise of options, net (in shares)	33,045
Common shares issued upon exercise of options, net		383	(126)		257
Restricted shares issued (in shares)	24,908
Restricted shares issued
Common shares issued upon exercise of Stock Appreciation Rights (SARs) (in shares)	3,428
Share-based compensation expense		1,052			1,052
Tax withheld on exercise of Stock Appreciation Rights (SARs)		(17)			(17)
Tax benefit from vesting of acquisition related restricted stock		105			105
Cash dividends declared			(1,402)		(1,402)
Net income			2,450		2,450
Cash flow hedges, net of taxes				140	140
Pensions, net of taxes				216	216
Change in currency translation adjustment, net of taxes				52	52
Comprehensive Income:					2,858
Balance (in shares) at Mar. 31, 2018	15,143,328
Balance at Mar. 31, 2018	$ 15	50,626	95,296	(6,871)	$ 139,066
Balance (in shares) at Dec. 31, 2018	15,202,387				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				55,344
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
Tax benefit from vesting of acquisition related restricted stock		30			30
Cash dividends declared			(1,515)		(1,515)
Net income			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)
Comprehensive Income:					2,590
Common stock reacquired and retired (in shares)	(55,602)
Common stock reacquired and retired		(203)	(789)		$ (992)
Balance (in shares) at Mar. 31, 2019	15,229,775				15,229,775
Balance at Mar. 31, 2019	$ 15	$ 56,536	$ 102,945	$ (7,771)	$ 151,725