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Note 15 - Business Acquisition (Details Textual) - USD ($) |  |  | 12 Months Ended
--- | --- | --- | ---
Oct. 31, 2017 | Dec. 16, 2016 | Dec. 31, 2017 | Dec. 31, 2016
Payments to Acquire Businesses, Gross |  |  | $ 419,813 | $ 500,000
Tantaline A/S of Nordborg [Member] | Asset Purchase Agreement [Member] |  |  |  |
Payments to Acquire Businesses, Gross |  | $ 500,000 |  |
MesoScribe Technologies, Inc [Member] |  |  |  |
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High |  |  | $ 300,000 |
MesoScribe Technologies, Inc [Member] | Asset Purchase Agreement [Member] |  |  |  |
Payments to Acquire Businesses, Gross | $ 500,000 |  |  |
Business Combination, Consideration Transferred | 800,000 |  |  |
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High | $ 300,000 |  |  |

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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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Period Type: | duration

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- Definition For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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- Details
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Namespace Prefix: |
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- Details
Name: | us-gaap_BusinessAcquisitionAxis=cvv_AssetPurchaseAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
Name: | us-gaap_CounterpartyNameAxis=cvv_MesoScribeTechnologiesIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |