SIGNIFICANT ACCOUNTING POLICIES (Details)	3 Months Ended
Mar. 31, 2018
Minimum
Payment terms number of days	30 days
Maximum
Payment terms number of days	90 days

Represents payment terms in number of days after invoice is billed to the customer.

No definition available.

Name:	cuo_PaymentTermsNumberOfDays
Namespace Prefix:	cuo_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration