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Note 4 - Revenue From Contracts With Customers (Details Textual) - USD ($)	3 Months Ended			6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Contract with Customer, Cumulative Catch-up Adjustment to Revenue, Change in Estimate of Transaction Price and Input Costs	$ (61,000)		$ (445,000)	$ (231,000)	$ (495,000)
Increase (Decrease) in Contract with Customer, Asset		$ 300,000		$ 296,670	$ (3,082,808)

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=118932676&loc=d3e3602-108585

+ Details

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