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Foreign Operations (Details) - USD ($)	3 Months Ended												12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Foreign operations:
Total sales	$ 39,065,000	$ 38,494,000	$ 47,368,000	$ 36,746,000	$ 49,072,000	$ 41,336,000	$ 39,006,000	$ 45,468,000	$ 46,564,000	$ 48,049,000	$ 54,856,000	$ 49,599,000	$ 161,673,000	$ 174,882,000	$ 199,068,000
Property, plant and equipment — net	68,631,000				70,601,000								68,631,000	70,601,000
United States
Foreign operations:
Total sales													103,513,000	119,018,000	129,651,000
Property, plant and equipment — net	40,594,000				42,547,000								40,594,000	42,547,000
Mexico
Foreign operations:
Total sales													52,496,000	51,389,000	63,586,000
Property, plant and equipment — net	$ 28,037,000				$ 28,054,000								28,037,000	28,054,000
Canada
Foreign operations:
Total sales													5,664,000	4,475,000	5,831,000
CoreComposites de Mexico, S. de R.L. de C.V.
Foreign operations:
Sales													$ 50,727,000	$ 49,708,000	$ 69,235,000
Expenses as a percentage of revenues													24.00%	22.00%	19.00%

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