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LEASES - Supplemental Cash Flow Information Related to Leases (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 27, 2021
Jun. 28, 2020
Jun. 27, 2021
Jun. 28, 2020
Leases [Abstract]        
Cash paid for operating leases $ 580,529 $ 601,248 $ 1,159,845 $ 1,106,779
Operating lease costs 522,496 525,679 1,045,793 1,016,698
Short-term lease costs $ 47,969 $ 108,359 $ 96,070 $ 234,737