The amount of purchase of previously leased asset as a part of litigation settlement.

No definition available.

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

- Definition

Amount of loss recognized in settlement of litigation and insurance claims. Excludes claims within an insurance entity's normal claims settlement process.

+ References

No definition available.

+ Details

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

- Definition

Amount before accumulated depletion of real estate held for productive use, excluding land held for sale.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.13)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 4
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=118951113&loc=d3e6812-107765

+ Details

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

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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

- Details

Name:	srt_LitigationCaseAxis=cuo_LitigationWithValcoOnLeasingPropertyInColoradoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

SUBSEQUENT EVENT (Details) - USD ($)		3 Months Ended	9 Months Ended
SUBSEQUENT EVENT (Details) - USD ($)	Oct. 15, 2019	Sep. 28, 2019	Sep. 28, 2019
Subsequent Event [Line Items]
Loss Related To Litigation Settlement		$ 6,400,000	$ 6,400,000
Valco
Subsequent Event [Line Items]
Land		$ 2,600,000	2,600,000
Loss Related To Litigation Settlement			$ 6,400,000
Valco \| Subsequent Event
Subsequent Event [Line Items]
Purchase of the previously leased land	$ 9,000,000