Represents the period over which existing cash balance, anticipated cash flow from operations and borrowings available under the credit agreement will be sufficient to cover expected cash needs including servicing debt and planned capital expenditures.

No definition available.

REVOLVING BANK LOAN AND LONG-TERM DEBT (Details)	9 Months Ended
REVOLVING BANK LOAN AND LONG-TERM DEBT (Details)	Sep. 28, 2019 USD ($) agreement	Sep. 29, 2018 USD ($)	Dec. 29, 2018 USD ($)
Debt Instrument [Line Items]
Number of separate amendments to the Credit agreement \| agreement	9
Period over which existing cash balance, anticipated cash flow from operations and borrowings available under the credit agreement will be sufficient to cover expected cash needs	12 months
Minimum \| Period Ending June 28, 2014 [Member]
Debt Instrument [Line Items]
Fixed charge coverage ratio	1.06
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Maximum revolving credit facility line	$ 20,000,000
Outstanding amount	0		$ 2,200,000
Highest balance outstanding during the period	2,200,000	$ 9,800,000
Average outstanding	405,000	$ 6,188,000
Outstanding amount of letters of credit total	5,620,000
Revolving Credit Facility [Member] \| Minimum
Debt Instrument [Line Items]
Maximum inventory borrowings	$ 8,500,000
Revolving Credit Facility [Member] \| Maximum
Debt Instrument [Line Items]
Borrowings as a percentage of eligible accounts receivable	80.00%
Borrowings as a percentage of eligible inventories	50.00%
Borrowings as a percentage of capital expenditures	80.00%
Annual capital expenditures for fiscal year 2016, maximum	$ 5,500,000
Revolving Credit Facility [Member] \| LIBOR
Debt Instrument [Line Items]
Variable interest rate base	LIBOR
Percentage points added to the reference rate	2.25%