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Note 12 - Defined Contribution Plan (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012
Compensation and Retirement Disclosure [Abstract] |  |
Minimum Period of Continuous Service to be Eligible for Defined Contribution Plan Participation | 3 months |
Defined Contribution Plan, Administrative Expenses | $ 2,380 | $ 2,317
Defined Contribution Plan, Employer Discretionary Contribution Amount | $ 0 | $ 0

X
- Definition Minimum Period of Continuous Service to be Eligible for Defined Contribution Plan Participation + References No definition available. + Details
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Namespace Prefix: | cvv_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of administrative expenses incurred by a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanAdministrativeExpenses
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration