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Commitments and Contingencies (Details) (USD $)
6 Months Ended
Jul. 01, 2012
Jul. 03, 2011
Dec. 31, 2011
Commitments and Contingencies (Textual) [Abstract]      
Warranty liability $ 1,009,000   $ 914,000
Warranty expense 221,000 187,000  
Period of extended warranty for link encryption products 3 years    
Period of extended warranty for link encryption products 5 years    
Deferred extended warranties 2,554,000   2,536,000
Outstanding purchase commitments 8,351,000    
Outstanding letters of credit $ 990,000