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Acquisition (Details Textual) (USD $)
3 Months Ended
Mar. 31, 2013
External Valuation Adjustments [Member]
Jan. 31, 2012
Valpey-Fisher [Member]
Mar. 31, 2013
D and R Technology [Member]
Dec. 31, 2012
D and R Technology [Member]
Acquisition (Textual) [Abstract]        
Business acquisition price   $ 18,300,000   $ 63,500,000
Fair value of accounts receivable and (Decrease) due to external adjustments (260,000)     7,693,000
Goodwill, Tax deduction period     15 years  
Percentage of common stock acquired   100.00%    
Increased amortizable intangible assets due to fair value adjustment 1,457,000      
Reduction in goodwill due to fair value adjustment 1,194,000      
Increased in account payable due to fair value adjustment $ 3,000