v3.20.1

FAIR VALUE MEASUREMENTS (Details) | Mar. 28, 2020 USD ($)
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Fair Value Measurements |
Fair value, financial instruments transferred between levels | $ 0

X
- Definition Amount of transfers of financial instruments measured on a recurring basis between all the levels of hierarchy. + References No definition available. + Details
Name: | cuo_FairValueMeasurementTransfersBetweenLevels
Namespace Prefix: | cuo_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_FairValueTransfersBetweenLevel1AndLevel2DescriptionAndPolicyAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration