INTANGIBLE ASSETS (Schedule of Intangible Assets) (Details) - USD ($)	3 Months Ended	9 Months Ended
Sep. 26, 2021	Sep. 27, 2020	Sep. 26, 2021	Sep. 27, 2020
Finite-Lived Intangible Assets [Line Items]
Amortization of acquired intangible assets	$ 610,208	$ 984,744	$ 1,820,355	$ 3,211,849
Amortization of intangible assets	1,000,005	1,064,230	2,351,502	3,476,416
Total expense	1,018,827	1,083,053	2,407,969	3,532,882
Client partner lists
Finite-Lived Intangible Assets [Line Items]
Amortization of acquired intangible assets	554,962	918,349	1,655,250	3,009,370
Covenants not to compete
Finite-Lived Intangible Assets [Line Items]
Amortization of acquired intangible assets	55,246	66,395	165,105	202,479
Amortization Expense \| Computer Software, Intangible Asset
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	389,797	79,486	531,147	264,567
Selling, General and Administrative Expenses \| Computer Software, Intangible Asset
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 18,822	$ 18,823	$ 56,467	$ 56,466