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COVID-19 (Details)	Jun. 12, 2020
Unusual or Infrequent Items, or Both [Abstract]
Current staffing level at Torrance facility (percent)	50.00%

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- References

No definition available.

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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