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)	53,164
Common shares issued upon exercise of options, net		581	(150)		431
Share-based compensation expense		1,868			1,868
Cash dividends declared			(4,335)		(4,335)
Tax benefit from vesting of acquisition related restricted stock		445			445
Shares reacquired and retired (in shares)	(14,334)
Shares reacquired and retired		(51)	(216)		(267)
Net earnings			12,389		12,389
Cash flow hedges, net of taxes				209	209
Pensions, net of taxes				647	647
Change in currency translation adjustment, net of taxes				(637)	(637)
ASC 606 adjustment to opening retained earnings			11,245		11,245
Restricted shares issued (in shares)	24,908
Restricted shares issued
Restricted shares issued in acquisition (in shares)	150,094
Restricted shares issued in acquisition		3,763			3,763
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)
Cash dividends declared, per share (in dollars per share)			$ 0.29
Balance (in shares) at Sep. 30, 2018	15,299,207
Balance at Sep. 30, 2018	$ 15	55,692	$ 102,062	(7,060)	150,709
Balance (in shares) at Jun. 30, 2018	15,311,541
Balance at Jun. 30, 2018	$ 15	54,998	97,664	(7,093)	145,584
Common shares issued upon exercise of options, net (in shares)	2,000
Common shares issued upon exercise of options, net		27			27
Share-based compensation expense		378			378
Cash dividends declared			(1,508)		(1,508)
Tax benefit from vesting of acquisition related restricted stock		340			340
Shares reacquired and retired (in shares)	(14,334)
Shares reacquired and retired		(51)	(216)		(267)
Net earnings			6,122		6,122
Cash flow hedges, net of taxes				(3)	(3)
Pensions, net of taxes				216	216
Change in currency translation adjustment, net of taxes				(180)	$ (180)
Cash dividends declared, per share (in dollars per share)					$ 0.10
Balance (in shares) at Sep. 30, 2018	15,299,207
Balance at Sep. 30, 2018	$ 15	55,692	102,062	(7,060)	$ 150,709
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)	62,994				75,444
Common shares issued upon exercise of options, net		460	(177)		$ 283
Share-based compensation expense		997			997
Cash dividends declared			(4,533)		(4,533)
Tax benefit from vesting of acquisition related restricted stock		30			30
Shares reacquired and retired (in shares)	(73,893)
Shares reacquired and retired		(269)	(974)		(1,243)
Net earnings			9,078		9,078
Cash flow hedges, net of taxes				(16)	(16)
Pensions, net of taxes				1,198	1,198
Change in currency translation adjustment, net of taxes				(295)	(295)
Restricted shares issued (in shares)	48,829
Restricted shares issued
Cash dividends declared, per share (in dollars per share)			$ 0.30
Balance (in shares) at Sep. 30, 2019	15,240,317				15,240,317
Balance at Sep. 30, 2019	$ 15	57,077	$ 106,426	(7,098)	$ 156,420
Balance (in shares) at Jun. 30, 2019	15,255,694
Balance at Jun. 30, 2019	$ 15	57,166	104,165	(7,226)	154,120
Common shares issued upon exercise of options, net (in shares)	300
Common shares issued upon exercise of options, net		3			3
Share-based compensation expense		(35)			(35)
Cash dividends declared			(1,510)		(1,510)
Shares reacquired and retired (in shares)	(15,677)
Shares reacquired and retired		(57)	(150)		(207)
Net earnings			3,921		3,921
Cash flow hedges, net of taxes				(5)	(5)
Pensions, net of taxes				449	449
Change in currency translation adjustment, net of taxes				(316)	$ (316)
Cash dividends declared, per share (in dollars per share)					$ 0.10
Balance (in shares) at Sep. 30, 2019	15,240,317				15,240,317
Balance at Sep. 30, 2019	$ 15	$ 57,077	$ 106,426	$ (7,098)	$ 156,420