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(6) Inventories - Inventories (Details) - USD ($)
Sep. 28, 2019
Dec. 29, 2018
Inventory Disclosure [Abstract]    
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