Condensed Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Capital in Excess of Par Value [Member]	Accumulated Loss [Member]	Accumulated Other Comprehensive Loss [Member]	Treasury Stock [Member]
Beginning Balance at Dec. 31, 2018	$ 178,560	$ 349	$ 251,409	$ (59,427)	$ (13,415)	$ (356)
Beginning Balance, Shares at Dec. 31, 2018		34,954				(138)
Net income	1,864			1,864
Cumulative effect adjustment | ASU 2018-02 and ASU 2014-09 [Member]	(4,590)			(4,602)	12
Restricted stock units issued	(8)		(8)
Restricted stock units issued, Shares		12
Share based compensation earned	798		798
Share based compensation earned, Shares		14
Adjustment for interest rate swap	(213)				(213)
Translation gain (loss)	979				979
Ending Balance at Mar. 31, 2019	177,390	$ 349	252,199	(62,165)	(12,637)	$ (356)
Ending Balance, Shares at Mar. 31, 2019		34,980				(138)
Beginning Balance at Dec. 31, 2019	193,017	$ 353	253,869	(46,344)	(14,505)	$ (356)
Beginning Balance, Shares at Dec. 31, 2019		35,275				(138)
Net income	3,412			3,412
Restricted stock units issued	(152)	$ (1)	(153)
Restricted stock units issued, Shares		63
Share based compensation earned	597		597
Translation gain (loss)	(2,268)				(2,268)
Ending Balance at Mar. 31, 2020	$ 194,606	$ 354	$ 254,313	$ (42,932)	$ (16,773)	$ (356)
Ending Balance, Shares at Mar. 31, 2020		35,338				(138)