Property, Plant And Equipment (Details) (USD $)	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 50,604,000		$ 50,914,000
Less: Accumulated depreciation	36,528,000		36,514,000
Property, plant and equipment, excluding construction in progress, net	14,076,000		14,400,000
Construction in progress	430,000		546,000
Total	14,506,000		14,946,000
Depreciation expense	2,300,000	6,400,000
Transportation Property And Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	10,140,000		10,140,000
Estimated Useful Life, maximum (in years)	3
Machinery And Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	18,681,000		18,978,000
Estimated Useful Life, minimum (in years)	3
Estimated Useful Life, maximum (in years)	10
Office Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	19,855,000		19,845,000
Estimated Useful Life, minimum (in years)	5
Estimated Useful Life, maximum (in years)	10
Autos And Trucks [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 1,928,000		$ 1,951,000
Estimated Useful Life, minimum (in years)	5
Estimated Useful Life, maximum (in years)	10