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Note 3 - Contracts in Progress (Details) - Costs, Estimated Earnings, and Billings on Uncompleted Contracts (USD $)
Dec. 31, 2014
Dec. 31, 2013
Costs, Estimated Earnings, and Billings on Uncompleted Contracts [Abstract]    
Costs incurred on contracts in progress $ 4,250,299cvv_CostsIncurredOnUncompletedContracts $ 1,807,628cvv_CostsIncurredOnUncompletedContracts
Estimated earnings 4,541,377cvv_EstimatedEarnings 1,229,038cvv_EstimatedEarnings
8,791,677cvv_CostsAndEstimatedEarningsOnUncompletedContracts 3,036,666cvv_CostsAndEstimatedEarningsOnUncompletedContracts
Billings to date (7,621,523)cvv_BillingsToDate (1,711,587)cvv_BillingsToDate
1,170,154cvv_NetCostInExcessOfBillings 1,325,079cvv_NetCostInExcessOfBillings
Costs and estimated earnings in excess of billings on contracts in progress 2,498,662us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrProgramsExpectedToBeCollectedWithinOneYear 1,577,969us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrProgramsExpectedToBeCollectedWithinOneYear
Billings in excess of costs and estimated earnings on contracts in progress $ (1,328,508)us-gaap_BillingsInExcessOfCostCurrent $ (252,890)us-gaap_BillingsInExcessOfCostCurrent