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Note 3 - Contracts in Progress - Changes in Estimates (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Increase in revenue from net changes in transaction prices | $ 254,000 | $ 148,000
Decrease in revenue from net changes in input cost estimates | (268,000) | (126,000)
Net (decrease) increase in revenue from net changes in estimates | $ (14,000) | $ 22,000
Number of projects | 10 | 2
Net change in estimate as a percentage of aggregate revenue for associated projects | (0.08%) | 0.06%

X
- Definition Amount of increase (decrease) in revenue recognized for cumulative catch-up adjustment from change in estimate of input costs. + References No definition available. + Details
Name: | cvv_ContractWithCustomerCumulativeCatchupAdjustmentToRevenueChangeInEstimateOfInputCosts
Namespace Prefix: | cvv_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of increase (decrease) in revenue recognized for cumulative catch-up adjustment from change in estimate of transaction price and input costs. + References No definition available. + Details
Name: | cvv_ContractWithCustomerCumulativeCatchupAdjustmentToRevenueChangeInEstimateOfTransactionPriceAndInputCosts
Namespace Prefix: | cvv_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of increase (decrease) in revenue recognized for cumulative catch-up adjustment from change in estimate of transaction price. + References No definition available. + Details
Name: | cvv_ContractWithCustomerRevenueChangeInEstimateOfTransactionPrice
Namespace Prefix: | cvv_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The percentage net change in estimate as a percentage of aggregate revenue for associated projects. + References No definition available. + Details
Name: | cvv_NetChangeInEstimateAsAPercentageOfAggregateRevenueForAssociatedProjects
Namespace Prefix: | cvv_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of projects that generate revenue. + References No definition available. + Details
Name: | cvv_RevenueRecognitionNumberOfProjects
Namespace Prefix: | cvv_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration