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Note 13 - Significant Risks and Uncertainties (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Note 13 - Significant Risks and Uncertainties (Details) [Line Items]
Cash, Uninsured Amount (in Dollars)	$ 10,216,263us-gaap_CashUninsuredAmount	$ 9,834,765us-gaap_CashUninsuredAmount
Number of Major Customers	1cvv_NumberOfMajorCustomers	1cvv_NumberOfMajorCustomers
Export Sales to Unaffiliated Customers as Percentage of Total Sales	20.20%cvv_ExportSalesToUnaffiliatedCustomersAsPercentageOfTotalSales	27.30%cvv_ExportSalesToUnaffiliatedCustomersAsPercentageOfTotalSales
Sales Revenue, Net [Member] | Customer Concentration Risk [Member]
Note 13 - Significant Risks and Uncertainties (Details) [Line Items]
Concentration Risk, Percentage	50.20%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember	23.70%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember

X

- Definition

Represents the percentage of total sales from export sales to unaffiliated customers.

+ References

No definition available.

+ Details

Name:	cvv_ExportSalesToUnaffiliatedCustomersAsPercentageOfTotalSales
Namespace Prefix:	cvv_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	cvv_Note13SignificantRisksandUncertaintiesDetailsLineItems
Namespace Prefix:	cvv_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the number of major customers.

+ References

No definition available.

+ Details

Name:	cvv_NumberOfMajorCustomers
Namespace Prefix:	cvv_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of cash as of the balance sheet date that is not insured by the Federal Deposit Insurance Corporation.

+ References

No definition available.

+ Details

Name:	us-gaap_CashUninsuredAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 21

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13537-108611



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13531-108611



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 18

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592

+ Details

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Namespace Prefix:	us-gaap_
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Period Type:	duration

X

- Details

Name:	us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_SalesRevenueNetMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: