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(6) Inventories (Tables)
9 Months Ended
Sep. 28, 2019
Inventory Disclosure [Abstract]  
Inventories
    September 28,      December 29,  
     2019      2018  
               
Raw materials  $668,141   $706,982 
Work in process   1,973,122    2,248,370 
Finished goods   614,210    693,943 
                
Total inventory   3,255,473    3,649,295 
Reserve for obsolescence   (464,362)   (456,362)
                
Inventories, net  $2,791,111   $3,192,933