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Note 12 - Significant Events- Coronavirus (Covid-19) (Details Textual) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2021	Jun. 30, 2021
Revenue, New Orders, Value	$ 6.1	$ 6.0

X

- Definition

The value of revenue from new orders during the period.

+ References

No definition available.

+ Details

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