v3.20.1

SUBSEQUENT EVENTS (Details) - Subsequent Event | May 11, 2020 stockholder | Apr. 17, 2020 director shares | Apr. 14, 2020 USD ($)
--- | --- | --- | ---
Subsequent Event [Line Items] |  |  |
Number of stockholders on record | stockholder | 300 |  |
Loan proceeds from PPP Loan | $ |  |  | $ 5,487,000
Continental Materials Corporation | Bee Street Holdings LLC |  |  |
Subsequent Event [Line Items] |  |  |
Number of Board Members | director |  | 3 |
Number of shares owned by parent | shares |  | 1,494,511 |
Ownership percentage |  | 89.20% |

X
- Definition Represents the number of board members. + References No definition available. + Details
Name: | cuo_NumberOfBoardMembers
Namespace Prefix: | cuo_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of shares owned by the parent company. + References No definition available. + Details
Name: | cuo_NumberOfSharesOwnedByParent
Namespace Prefix: | cuo_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of stockholders on record. + References No definition available. + Details
Name: | cuo_NumberOfStockholdersOnRecord
Namespace Prefix: | cuo_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Cash inflow associated with loan from governmental loan program. + References No definition available. + Details
Name: | cuo_ProceedsFromLoanRelatedToPaycheckProtectionProgram
Namespace Prefix: | cuo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The parent entity's interest in net assets of the subsidiary, expressed as a percentage. + References No definition available. + Details
Name: | us-gaap_MinorityInterestOwnershipPercentageByParent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- 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

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

X
- Details
Name: | srt_OwnershipAxis=cuo_ContinentalMaterialsCorporationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=cuo_BeeStreetHoldingsLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |