Factored Accounts and Receivables - CIT Factoring Agreement (Details) - CIT Factoring Agreement	12 Months Ended
Dec. 31, 2018
Accounts receivable, inventory advances and due from factor
Required notice period for termination of the agreement by factor	60 days
Required written notice period for termination of the agreement prior to October 29, 2023	60 days

Represents the required notice period prior to specified period, for the termination of an agreement by the entity as defined in the agreement.

No definition available.

Name:	ctrc_AccountsReceivableFactoringAgreementTerminationByEntityRequiredNoticePeriodPriorToSpecifiedPeriod
Namespace Prefix:	ctrc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration