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LEASES - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 26, 2021
Sep. 27, 2020
Sep. 26, 2021
Sep. 27, 2020
Dec. 27, 2020
Leases [Abstract]          
Operating lease, weighted average remaining lease term (years) 2 years 10 months 24 days   2 years 10 months 24 days   3 years 6 months
Operating lease, weighted average discount rate, percent 4.90%   4.90%    
Cash paid for operating leases $ 579,844 $ 601,248 $ 1,739,688 $ 1,612,201  
Operating lease costs 519,496 525,679 1,565,289 1,536,718  
Short-term lease costs $ 75,406 $ 108,359 $ 108,514 $ 308,543