Property, Plant and Equipment (Detail Textuals) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Accumulated amortization	$ 15,229		$ 15,229		$ 14,909
Depreciation and amortization expense	177	$ 171	340	$ 340
CPG
Property, Plant and Equipment [Line Items]
Construction in progress	300		300		2,529
Additions to construction in progress	2,400		2,400
ATG
Property, Plant and Equipment [Line Items]
Construction in progress	60		60		288
Land and building | Elma
Property, Plant and Equipment [Line Items]
Nominal amount of capital lease	5,000		5,000
Buildings
Property, Plant and Equipment [Line Items]
Accumulated amortization	$ 2,876		$ 2,876		$ 2,811