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Long-term Debt (Details Narrative) - USD ($) $ in Millions	Dec. 31, 2022	Sep. 30, 2022
Debt Disclosure [Abstract]
Loan to fund acquisition of machinery equipment	$ 0.4	$ 0.4

X

- Definition

Loan to fund acquisition of machinery equipment.

+ References

No definition available.

+ Details

Name:	CVV_LoanToFundAcquisitionOfMachineryEquipment
Namespace Prefix:	CVV_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_DebtDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration