Unaudited Condensed Consolidated Statements of Changes in Equity - USD ($) $ in Thousands		Total		Capital in Excess of Par Value	Treasury Stock	Retained Earnings	Foreign Currency	Deferred Gain (Loss) on Cash Flow Hedging	Pension Plan Adjustment	Class A Common Stock	Class A Common Stock Common Stock		Class B Common Stock	Class B Common Stock Common Stock
Balance, beginning of period at Dec. 31, 2017		$ 46,408		$ 47,773	$ 0	$ 12,603	$ (7,934)	$ 508	$ (6,678)		$ 88			$ 48
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss		(418)				(418)
Issuance of common stock, net of conversions	[1],[2]	324		323							4			(3)
Share-based compensation expense		955		955
Cash dividends on Class A Common and Class B Common		(1,162)				(1,162)
Current period other comprehensive income		1,206					917	289
Reclassification adjustment to net loss		324						166	158
Balance, end of period at Mar. 31, 2018		47,637		49,051	0	12,191	(7,017)	1,081	(7,806)		92			45
Balance, beginning of period at Dec. 31, 2017		46,408		47,773	0	12,603	(7,934)	508	(6,678)		88			48
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss		(1,292)
Balance, end of period at Jun. 30, 2018		46,010		50,721	0	10,152	(8,922)	1,586	(7,664)		92			45
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Class B Common converted to Class A Common (in shares)													331,000
Class A Common shares issued (in shares)										22,000
Balance, beginning of period at Mar. 31, 2018		47,637		49,051	0	12,191	(7,017)	1,081	(7,806)		92			45
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss		(874)				(874)
Issuance of common stock, net of conversions	[1],[2]	198		198
Share-based compensation expense		1,472		1,472
Cash dividends on Class A Common and Class B Common		(1,165)				(1,165)
Current period other comprehensive income		(1,441)					(1,905)	464
Reclassification adjustment to net loss		183						41	142
Balance, end of period at Jun. 30, 2018		46,010		50,721	0	10,152	(8,922)	1,586	(7,664)		92			45
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Class B Common converted to Class A Common (in shares)													45,000
Class A Common shares issued (in shares)										9,000
Balance, beginning of period at Dec. 31, 2018		65,438		51,714	0	30,897	(9,099)	1,023	(9,234)		93			44
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss		(1,761)				(1,761)
Issuance of common stock, net of conversions		1	[1],[2]	(1)							2	[1],[2]
Share-based compensation expense		807		807
Cash dividends on Class A Common and Class B Common		(1,177)				(1,177)
Current period other comprehensive income		(221)					345	(566)
Reclassification adjustment to net loss		(8)						2	(10)
Balance, end of period at Mar. 31, 2019		63,079		52,520	0	27,959	(8,754)	459	(9,244)		95			44
Balance, beginning of period at Dec. 31, 2018		65,438		51,714	0	30,897	(9,099)	1,023	(9,234)		93			44
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss		(2,705)
Balance, end of period at Jun. 30, 2019		59,097		53,342	(2,334)	25,773	(8,407)	(274)	(9,142)		95			44
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Class B Common converted to Class A Common (in shares)													39,000
Class A Common shares issued (in shares)										139,000
Balance, beginning of period at Mar. 31, 2019		63,079		52,520	0	27,959	(8,754)	459	(9,244)		95			44
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss		(944)				(944)
Share-based compensation expense		822		822
Cash dividends on Class A Common and Class B Common		(1,242)				(1,242)
Current period other comprehensive income		(530)					347	(877)
Reclassification adjustment to net loss		246						144	102
Purchase of treasury stock		(2,334)			(2,334)
Balance, end of period at Jun. 30, 2019		$ 59,097		$ 53,342	$ (2,334)	$ 25,773	$ (8,407)	$ (274)	$ (9,142)		$ 95			$ 44
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Class B Common converted to Class A Common (in shares)													2,000
Class A Common shares issued (in shares)										10,000

[1] (1) Class B Common converted to Class A Common were 2 and 39 shares during the three and six months ending June 30, 2019, respectively, and 45 and 331 shares during the three and six months ending June 30, 2018, respectively.

[2] 2) The Company issued Class A Common shares of 10 and 139 during the three and six months ending June 30, 2019, respectively, and 9 and 22 during the three and six months ending June 30, 2018, respectively.