RELATED PARTY TRANSACTIONS (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 29, 2019	Dec. 30, 2018
Director
Related Party Transactions
Revenues and NAF contributions	$ 1,649	$ 1,538
Accounts receivable from related parties	290	271
Beneficial Owner
Related Party Transactions
Revenues and NAF contributions	314	308
Accounts receivable from related parties	$ 77	$ 44
Beneficial ownership percentage	18.20%

For an unclassified balance sheet, amount of receivables arising from transactions with related parties.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant