Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Statement [Abstract]
Net sales	$ 65,409	$ 64,433	$ 198,270	$ 203,995
Operating costs and expenses:
Costs of products sold (excluding depreciation)	53,244	48,177	158,715	158,577
Selling and administrative	8,950	8,979	27,424	28,135
Depreciation	2,941	2,840	9,007	8,725
Credit for asbestos litigation	0	(16,340)	0	(16,340)
Loss on disposal of assets	232	0	287	19
Total operating expenses	65,367	43,656	195,433	179,116
Income from operations	42	20,777	2,837	24,879
Other income (expense):
Investment-related income	38	27	125	51
Interest expense	(61)	(60)	(169)	(181)
Other - net	(395)	(532)	(344)	(1,539)
Total other income (expense)	(418)	(565)	(388)	(1,669)
(Loss) income before income taxes and equity losses in Chinese joint venture	(376)	20,212	2,449	23,210
Income tax benefit (provision)	178	(7,057)	(773)	(7,958)
Equity losses in Chinese joint venture	(145)	(450)	(820)	(1,315)
Net (loss) income	$ (343)	$ 12,705	$ 856	$ 13,937
Net (loss) income per common share:
Basic	$ (0.03)	$ 1.23	$ 0.08	$ 1.35
Diluted	$ (0.03)	$ 1.22	$ 0.08	$ 1.34
Cash dividends declared per share	$ 0.18	$ 0.18	$ 0.54	$ 0.54
Weighted average number of common shares outstanding:
Basic	10,424	10,363	10,398	10,355
Diluted	10,477	10,408	10,448	10,404