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, 2017	15,081,947
Balance at Dec. 31, 2017	$ 15	$ 49,103	$ 83,129	$ (7,279)	$ 124,968
Common shares issued upon exercise of options, net (in shares)	51,164
Common shares issued upon exercise of options, net		554	(150)		404
Restricted shares issued in acquisition (in shares)	150,094
Restricted shares issued in acquisition		3,763			3,763
Share-based compensation expense		1,490			1,490
Cash dividends declared			(2,827)		(2,827)
Net earnings			6,267		6,267
Cash flow hedges, net of taxes				212	212
Pensions, net of taxes				431	431
Change in currency translation adjustment, net of taxes				(457)	(457)
Comprehensive Income:					6,453
Restricted shares issued (in shares)	24,908
Restricted shares issued
ASC 606 adjustment to opening retained earnings			11,245		11,245
Common shares issued upon exercise of Stock Appreciation Rights (SARs) (in shares)	3,428
Tax withheld on exercise of Stock Appreciation Rights (SARs)		(17)			(17)
Tax benefit from vesting of acquisition related restricted stock		105			105
Balance (in shares) at Jun. 30, 2018	15,311,541
Balance at Jun. 30, 2018	$ 15	54,998	97,664	(7,093)	145,584
Balance (in shares) at Mar. 31, 2018	15,143,328
Balance at Mar. 31, 2018	$ 15	50,626	95,296	(6,871)	139,066
Common shares issued upon exercise of options, net (in shares)	18,119
Common shares issued upon exercise of options, net		171	(24)		147
Restricted shares issued in acquisition (in shares)	150,094
Restricted shares issued in acquisition		3,763			3,763
Share-based compensation expense		438			438
Cash dividends declared			(1,425)		(1,425)
Net earnings			3,817		3,817
Cash flow hedges, net of taxes				72	72
Pensions, net of taxes				215	215
Change in currency translation adjustment, net of taxes				(509)	(509)
Comprehensive Income:					3,595
Balance (in shares) at Jun. 30, 2018	15,311,541
Balance at Jun. 30, 2018	$ 15	54,998	97,664	(7,093)	$ 145,584
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)	62,694				75,144
Common shares issued upon exercise of options, net		457	(177)		$ 280
Share-based compensation expense		1,032			1,032
Cash dividends declared			(3,023)		(3,023)
Net earnings			5,157		5,157
Cash flow hedges, net of taxes				(11)	(11)
Pensions, net of taxes				749	749
Change in currency translation adjustment, net of taxes				21	21
Comprehensive Income:					5,916
Restricted shares issued (in shares)	48,829
Restricted shares issued
Common stock reacquired and retired (in shares)	(58,216)
Common stock reacquired and retired		(212)	(824)		(1,036)
Tax benefit from vesting of acquisition related restricted stock		30			$ 30
Balance (in shares) at Jun. 30, 2019	15,255,694				15,255,694
Balance at Jun. 30, 2019	$ 15	57,166	104,165	(7,226)	$ 154,120
Balance (in shares) at Mar. 31, 2019	15,229,775
Balance at Mar. 31, 2019	$ 15	56,536	102,945	(7,771)	151,725
Common shares issued upon exercise of options, net (in shares)	18,533
Common shares issued upon exercise of options, net		88	(18)		70
Share-based compensation expense		551			551
Cash dividends declared			(1,508)		(1,508)
Net earnings			2,781		2,781
Cash flow hedges, net of taxes				(6)	(6)
Pensions, net of taxes				502	502
Change in currency translation adjustment, net of taxes				49	49
Comprehensive Income:					3,326
Restricted shares issued (in shares)	10,000
Restricted shares issued
Common stock reacquired and retired (in shares)	(2,614)
Common stock reacquired and retired		(9)	(35)		$ (44)
Balance (in shares) at Jun. 30, 2019	15,255,694				15,255,694
Balance at Jun. 30, 2019	$ 15	$ 57,166	$ 104,165	$ (7,226)	$ 154,120