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INTANGIBLE ASSETS (Schedule of Intangible Assets) (Details) - USD ($)
 3 Months Ended
Mar. 28, 2021
Mar. 29, 2020
Finite-Lived Intangible Assets [Line Items]    
Amortization of acquired intangible assets $ 599,942 $ 1,120,305
Amortization of intangible assets 658,407 1,187,442
Total expense 677,229 1,206,264
Client partner lists    
Finite-Lived Intangible Assets [Line Items]    
Amortization of acquired intangible assets 545,327 1,050,616
Covenants not to compete    
Finite-Lived Intangible Assets [Line Items]    
Amortization of acquired intangible assets 54,615 69,689
Amortization Expense | Computer Software, Intangible Asset    
Finite-Lived Intangible Assets [Line Items]    
Amortization of intangible assets 58,465 67,137
Selling, General and Administrative Expenses | Computer Software, Intangible Asset    
Finite-Lived Intangible Assets [Line Items]    
Amortization of intangible assets $ 18,822 $ 18,822