RELATED PARTY TRANSACTIONS (Details)	12 Months Ended
Dec. 30, 2017 USD ($) company	Dec. 31, 2016 USD ($)
RELATED PARTY TRANSACTIONS
Amount paid for service rendered by related party	$ 510,000	$ 522,000
Number of law firms \| company	3
Amount of contingent fee received by related party	$ 14,000	$ 213,000

Represents the amount received by the related party as a contingent fee under the agreement.

No definition available.

Name:	cuo_RelatedPartyTransactionContingentFeeToRelatedParty
Namespace Prefix:	cuo_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration