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v3.20.4

COVID-19 (Details) | Dec. 14, 2020
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Unusual or Infrequent Items, or Both [Abstract] |
Current staffing level at Torrance facility (percent) | 50.00%

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

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- Definition Current Staffing Level at Facility, Percent + References No definition available. + Details
Name: | virc_CurrentStaffingLevelatFacilityPercent
Namespace Prefix: | virc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration