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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 30, 2017
Commitments Tables  
Minimum future rental payments
Fiscal years ending:      
2018   $ 601,000  
2019     590,000  
2020     424,000  
2021     340,000  
2022     138,000  
Thereafter     167,000  
    $ 2,260,000  
Purchase obligations
Fiscal years ending:      
2018   $ 3,489,000  
2019     82,000  
    $ 3,571,000  
Minimum royalties including license maintenance fees
Fiscal years ending:      
2018   $ 446,000  
2019     612,000  
2020     467,000  
2021     485,000  
2022     450,000  
    $ 2,460,000