DEBT (Schedule of Long Term Debt) (Details) - Credit Agreement - Long-term Debt - USD ($)	Dec. 27, 2020	Dec. 29, 2019
BMO Harris Bank, N.A.
Debt Instrument [Line Items]
Long-term debt, gross, initial borrowing	$ 4,300,000
Long-term debt, gross, second borrowing amount	24,625,000
Long-term debt, gross	$ 28,925,000
Texas Capital Bank, National Association (TCB)
Debt Instrument [Line Items]
Long-term debt, gross, initial borrowing		$ 7,500,000
Interest rate, initial borrowing amount	2.15%	5.25%
Long-term debt, gross, second borrowing amount		$ 0
Interest rate, second borrowing amount	2.39%	0.00%
Long-term debt, gross		$ 7,500,000