Business Segment, Geographic and Major Customer Information (Details Textual)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012 Businessdivision	Sep. 30, 2011
Segment Information (Additional Textual) [Abstract]
Reportable segments			3
Maximum [Member]
Segment Information (Textual) [Abstract]
Percentage of revenue by countries other than United States			10.00%
Chemicals [Member]
Segment Information (Textual) [Abstract]
Percentage of customer A's revenue attributable to Chemicals segment	97.00%	97.00%	97.00%	97.00%
Number of business division			2