SUBSEQUENT EVENT (Details) - Subsequent Event - Continental Materials Corporation - Bee Street Holdings LLC	Feb. 18, 2020 $ / shares shares
Subsequent Event [Line Items]
Number of shares owned by parent \| shares	1,027,171
Ownership percentage	61.30%
Purchase price per share of remaining shares offered	$ 9.50
Tender offer agreement, minimum percentage of issued and outstanding common stock	90.00%
Right to receive per share	$ 9.50

Represents the right to receive per share amount under the merger.

No definition available.

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- Definition

Represents the number of shares owned by the parent company.

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No definition available.

+ Details

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- Definition

Represents the purchase price per share of remaining shares not owned by the purchasing company.

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No definition available.

+ Details

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- Definition

Minimum percentage of issued and outstanding Common Stock of the company that needs to owned in order to undergo the tender offer.

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No definition available.

+ Details

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- Definition

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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No definition available.

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- 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.

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No definition available.

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- Details

Name:	srt_OwnershipAxis=cuo_ContinentalMaterialsCorporationMember
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- Details

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