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Note 11 - Employee Retention Credit (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Increase (Decrease) in Employee Retention Credit Receivable	$ 1,529	$ (0)
Employee Retention Credit Receivable, Noncurrent	1,529	0
Employee retention credits	$ 1,529	$ 0

X

- Definition

Amount of employee retention credit receivable classified as noncurrent.

+ References

No definition available.

+ Details

Name:	cvv_EmployeeRetentionCreditReceivableNoncurrent
Namespace Prefix:	cvv_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of income from employee retention tax credits.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of increase (decrease) in employee retention credit receivable.

+ References

No definition available.

+ Details

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