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Note 8 - Stock-based Compensation Expense (Details Textual) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Share-based Payment Arrangement, Expense, Par Value	$ 65,000	$ 99,000	$ 206,000	$ 476,000

X

- Definition

Represents the amount of share-based payment arrangement, expense, par Value.

+ References

No definition available.

+ Details

Name:	cvv_SharebasedPaymentArrangementExpenseParValue
Namespace Prefix:	cvv_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration