Segment Information (Detail Textuals 1)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Segment Reporting Information [Line Items]
Revenues from sales by product, percentage	100.00%	100.00%	100.00%
Percentage of employees in an in-house collective bargaining agreement	27.00%
HITOX
Segment Reporting Information [Line Items]
Revenues from sales by product, percentage	33.00%	43.00%	39.00%
U.S. operation
Segment Reporting Information [Line Items]
Revenues from sales by product, percentage	48.00%	49.00%	52.00%