v3.20.1

FAIR VALUE MEASUREMENT - ARO Liabilities (Details) | Mar. 28, 2020 Y
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Risk-free interest rate |
FAIR VALUE MEASUREMENT |
ARO measurement input | 3.66
Expected term (years) |
FAIR VALUE MEASUREMENT |
ARO measurement input | 4.5

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- Definition Value of input used to measure the fair value of asset retirement obligation liabilities. + References No definition available. + Details
Name: | cuo_AssetRetirementObligationMeasurementInput
Namespace Prefix: | cuo_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

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- 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_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputRiskFreeInterestRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputExpectedTermMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |