Condensed Consolidated Statement of Shareholders' Equity Statement - USD ($)	Total	Class B Common Shares [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Treasury Stock [Member]
Total Shareholders’ Equity at Dec. 31, 2018	$ 359,147,000	$ 2,000	$ 9,419,000	$ 297,919,000	$ 142,447,000	$ 12,793,000	$ (103,433,000)
Allocated Share-based Compensation Expense	117,000		29,000	436,000			(348,000)
Adjustments to Additional Paid in Capital, Share-based Compensation, Stock Options, Requisite Service Period Recognition	124,000			124,000
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	808,000		140,000	701,000			(33,000)
Net Loss	(13,886,000)				(13,886,000)
Foreign currency translation adjustments	5,102,000
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	5,102,000
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	(488,000)					(488,000)
Amortization of prior service costs and unrecognized(losses) gains	26,000
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, after Tax	26,000
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	(9,246,000)
Payments of Ordinary Dividends, Common Stock	(408,000)
Dividends, Common Stock, Cash	(408,000)
Total Shareholders’ Equity at Mar. 31, 2019	350,542,000	2,000	9,588,000	299,180,000	128,153,000	17,433,000	(103,814,000)
Total Shareholders’ Equity at Dec. 31, 2019	308,516,000	2,000	9,588,000	312,650,000	87,475,000	3,128,000	(104,327,000)
Stock Issued During Period, Value, Stock Options Exercised	774,000		(90,000)	90,000			(774,000)
Allocated Share-based Compensation Expense	394,000		0	394,000			0
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	806,000		137,000	669,000			0
Net Loss	732,000				732,000
Foreign currency translation adjustments	(4,194,000)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(4,194,000)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	(142,000)					(142,000)
Amortization of prior service costs and unrecognized(losses) gains	(169,000)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	(3,773,000)
Payments of Ordinary Dividends, Common Stock	(414,000)
Dividends, Common Stock, Cash	(414,000)
Adoption of Credit Loss Standard	(243,000)
Total Shareholders’ Equity at Mar. 31, 2020	$ 304,512,000	$ 2,000	$ 9,815,000	$ 313,623,000	$ 87,550,000	$ (1,377,000)	$ (105,101,000)