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Note 12 - Subsequent Event (Details Textual) - Eastside [Member] - Subsequent Event [Member] - USD ($)	Oct. 31, 2019	Oct. 30, 2019
Terminated Monthly Rental Income	$ 31,667	$ 31,667
Terminated Annual Rent Income	$ 380,000	$ 380,000

X

- Definition

Terminated Annual Rental Income

+ References

No definition available.

+ Details

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

X

- Definition

Terminated monthly rental income

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_LeaseArrangementTypeAxis=cvv_EastsideMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: