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Note 13 - Sale-leaseback Transaction (Details Textual) - Premise, 335 Building [Member] | Sep. 22, 2022 USD ($)
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Sale Leaseback Transaction, Sale Price | $ 28.5
Sale Leaseback Transaction, Annual Fixed Rent | $ 1.5
Sale Leaseback Transaction, Annual Rent, Increase, Percent | 3.00%
Assets Held for Sale [Member] |
Sale Leaseback Transaction, Net Book Value, Total | $ 30,000,000

X
- Definition Represents annual fixed rent amounts of leases that are under sale leaseback transactions. + References No definition available. + Details
Name: | cvv_SaleLeasebackTransactionAnnualFixedRent
Namespace Prefix: | cvv_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represents increase of annual fixed rent from previous years under sale leaseback transaction as a percentage. + References No definition available. + Details
Name: | cvv_SaleLeasebackTransactionAnnualRentIncreasePercent
Namespace Prefix: | cvv_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition The sale price of the property to another party and lease back to the seller. + References No definition available. + Details
Name: | cvv_SaleLeasebackTransactionSalePrice
Namespace Prefix: | cvv_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The net book value of the asset(s) sold in connection with the sale of the property to another party and lease back to the seller. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 55 -Paragraph 51 -URI https://asc.fasb.org/extlink&oid=123386837&loc=d3e51840-112757 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 40 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=128295416&loc=SL77919786-209982 Reference 3: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 55 -Paragraph 52 -URI https://asc.fasb.org/extlink&oid=123386837&loc=d3e51843-112757 Reference 4: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 55 -Paragraph 50 -URI https://asc.fasb.org/extlink&oid=123386837&loc=d3e51831-112757 + Details
Name: | us-gaap_SaleLeasebackTransactionNetBookValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_SaleLeasebackTransactionDescriptionAxis=cvv_Premise335BuildingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_BalanceSheetLocationAxis=cvv_AssetsHeldForSaleMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |