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Note 13 - Significant Risks and Uncertainties (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Note 13 - Significant Risks and Uncertainties (Details) [Line Items] |  |
Cash, Uninsured Amount (in Dollars) | $ 10,216,263 us-gaap_CashUninsuredAmount | $ 9,834,765 us-gaap_CashUninsuredAmount
Number of Major Customers | 1 cvv_NumberOfMajorCustomers | 1 cvv_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

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- Definition Represents the percentage of total sales from export sales to unaffiliated customers. + References No definition available. + Details
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- Definition Represents the number of major customers. + References No definition available. + Details
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- 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
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- 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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