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Long-term Debt (Details Narrative) - USD ($) $ in Millions | Dec. 31, 2022 | Sep. 30, 2022
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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

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