v3.20.1

NON-EMPLOYEE DIRECTORS SHARE-BASED COMPENSATION (Details) - Director	Dec. 13, 2019 USD ($) shares	Feb. 07, 2019 director shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares issued to eligible board members	16,998	21,000
Number of eligible board members	6	7

X

- Definition

Represents the number of eligible board members to whom share options (or share units) granted during the period under the 2010 Non-Employee Directors Stock Plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	cuo_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of shares issued in lieu of cash for services contributed to the entity. Number of shares includes, but is not limited to, shares issued for services contributed by vendors and founders.

+ References

No definition available.

+ Details

Name:	us-gaap_StockIssuedDuringPeriodSharesIssuedForServices
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=srt_DirectorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: