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Segment and Major Customer Information (Tables)
3 Months Ended
Sep. 30, 2013
Segment Reporting [Abstract]  
Schedule of Segment Reporting Information, by Segment [Table Text Block] The following table sets forth segment net revenue, gross profit and gross margin for the three months ended September 30, 2013 and 2012:

    Three Months Ended September 30,  
    2013     2012  
Metrology Solutions                
Net revenue   $ 26,444     $ 25,878  
Gross profit   $ 14,557     $ 14,335  
Gross margin     55 %     55 %
                 
Optical Systems                
Net revenue   $ 13,674     $ 14,328  
Gross profit   $ 3,780     $ 3,158  
Gross margin     28 %     22 %
                 
Total                
Net revenue   $ 40,118     $ 40,206  
Gross profit   $ 18,337     $ 17,493  
Gross margin     46 %     44 %
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block] The following table sets forth revenue by geographic area:

    Three Months Ended September 30,    
    2013     2012    
Americas   $ 19,094       $ 18,863  
Japan     8,802       6,331    
China     3,747       7,538    
Europe     5,271       4,822    
Pacific Rim     3,204       2,652    
Total   $ 40,118     $ 40,206