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Note 4 - Revenue Disaggregation (Details Textual) - USD ($)	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Contract with Customer, Cumulative Catch-up Adjustment to Revenue, Change in Estimate of Transaction Price and Input Costs	$ 5,700,000
Increase (Decrease) in Contract with Customer, Asset	1,133,887	$ 480,889
Approximation [Member]
Increase (Decrease) in Contract with Customer, Asset	$ 1,100,000	$ 5,000,000

X

- Definition

Amount of increase (decrease) in revenue recognized for cumulative catch-up adjustment from change in estimate of transaction price and input costs.

+ References

No definition available.

+ Details

Name:	cvv_ContractWithCustomerCumulativeCatchupAdjustmentToRevenueChangeInEstimateOfTransactionPriceAndInputCosts
Namespace Prefix:	cvv_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of increase (decrease) in right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585

+ Details

Name:	us-gaap_IncreaseDecreaseInContractWithCustomerAsset
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	srt_StatementScenarioAxis=cvv_ApproximationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: