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

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

RELATED PARTY TRANSACTIONS (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2020	Jun. 30, 2019	Jun. 28, 2020	Jun. 30, 2019	Dec. 29, 2019
Director
Related Party Transactions
Revenues and NAF contributions	$ 281	$ 432	$ 626	$ 820
Accounts receivable from related parties	203		203		$ 290
Beneficial Owner
Related Party Transactions
Revenues and NAF contributions	252	$ 84	292	$ 161
Accounts receivable from related parties	$ 57		$ 57		$ 77
Beneficial ownership percentage			18.20%