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Commitments and Contingencies (Details Textual) (USD $)
3 Months Ended
Mar. 31, 2013
Apr. 01, 2012
Dec. 31, 2012
Commitments and Contingencies (Textual) [Abstract]      
Warranty liability $ 1,045,000   $ 1,111,000
Warranty expense 65,000 105,000  
Period of extended warranty for link encryption products 3 years    
Period of extended warranty for link encryption products 5 years    
Deferred extended warranties 2,398,000   2,607,000
Outstanding purchase commitments 6,923,000    
Outstanding letters of credit $ 999,000