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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Changes In The Allowance For Doubtful Accounts (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jul. 01, 2018
Jun. 30, 2019
Jul. 01, 2018
Dec. 30, 2018
Allowance for Doubtful Accounts Receivable [Roll Forward]          
Beginning balance     $ 468,233 $ 473,573  
Provision for (recovery of) doubtful accounts, net $ 24,855 $ (179,446) (28,602) 17,875  
Amounts (written off) collected, net 24,855     17,875  
Amounts (written off) collected, net   (179,446) (28,602)    
Allowance for Doubtful Accounts Receivable, Current $ 468,233 $ 473,573 $ 468,233 $ 473,573 $ 468,233