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Acquisition (Details Textual) (USD $)
6 Months Ended
Jul. 01, 2012
Jul. 01, 2012
Valpey-Fisher [Member]
Jan. 31, 2012
Valpey-Fisher [Member]
Jan. 31, 2011
Fordahl SA [Member]
Acquisition (Textual) [Abstract]        
Percentage of common stock acquired     100.00%  
Business acquisition price     $ 18,300,000 $ 2,900,000
Date of acquisition   Jan. 23, 2012    
Acquisition (Additional Textual) [Abstract]        
Fair value of accounts receivable 2,479,000      
Cash acquired 3,578,000      
Goodwill is expected to be deductible for tax purposes $ 0