RENTAL EXPENSE, LEASES AND COMMITMENTS - Additional Information (Details)	12 Months Ended
	Dec. 28, 2019 USD ($)
RENTAL EXPENSE, LEASES AND COMMITMENTS
Operating lease cost	$ 1,979,000
Short-term lease costs	623,000
Right-of-use assets	665,000
Lease liabilities	$ 572,000
Weighted-average remaining lease term	4 years 7 months 24 days
Weighted-average discount rate	6.02%