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Significant Customer Information Schedule of sales to Applied Materials as a percent of total sales (Details)
 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sales Revenue, Goods, Net [Member]
Customer Concentration Risk [Member]
Sep. 30, 2012
Sales Revenue, Goods, Net [Member]
Customer Concentration Risk [Member]
Sep. 30, 2011
Sales Revenue, Goods, Net [Member]
Customer Concentration Risk [Member]
Sep. 30, 2012
Applied Materials, Inc. [Member]
Sales Revenue, Goods, Net [Member]
Customer Concentration Risk [Member]
Sep. 30, 2012
Applied Materials, Inc. [Member]
Accounts Receivable [Member]
Customer Concentration Risk [Member]
Sep. 30, 2012
Minimum [Member]
Accounts Receivable [Member]
Customer Concentration Risk [Member]
Dec. 31, 2011
Minimum [Member]
Accounts Receivable [Member]
Customer Concentration Risk [Member]
Sep. 30, 2012
Minimum [Member]
Applied Materials, Inc. [Member]
Sales Revenue, Goods, Net [Member]
Customer Concentration Risk [Member]
Sep. 30, 2011
Minimum [Member]
Applied Materials, Inc. [Member]
Sales Revenue, Goods, Net [Member]
Customer Concentration Risk [Member]
Sep. 30, 2012
Minimum [Member]
Applied Materials, Inc. [Member]
Sales Revenue, Goods, Net [Member]
Customer Concentration Risk [Member]
Sep. 30, 2011
Minimum [Member]
Applied Materials, Inc. [Member]
Sales Revenue, Goods, Net [Member]
Customer Concentration Risk [Member]
Sep. 30, 2012
Minimum [Member]
Applied Materials, Inc. [Member]
Accounts Receivable [Member]
Customer Concentration Risk [Member]
Concentration Risk [Line Items]                          
Applied Materials   11.00% 14.70% 13.00% 12.00% 11.10% 10.00% 10.00% 10.00% 10.00% 10.00% 10.00% 0.00%
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]
Sales to these customers as a percent of total sales were as follows:
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
 
2012
 
2011
 
2012
 
2011
Applied Materials, Inc.
 
12.0
%
 
11.0
%
 
14.7
%
 
13.0
%
Swinterton Builders, Inc
 
11.1
%
 
N/A

 
N/A

 
N/A