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Note 1 - The Company and Description of Business (Details Textual) $ in Millions, $ in Millions | Jan. 31, 2023 USD ($) | Jan. 01, 2023 USN ($)
--- | --- | ---
National Institute of Aging Grant [Member] |  |
Government Assistance, Asset | $ 21 | $ 21

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- Definition Amount of asset from government assistance. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 832 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483507/832-10-50-3 + Details
Name: | us-gaap_GovernmentAssistanceAmountCumulative
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_TypeOfArrangementAxis=crvo_NationalInstituteOfAgingGrantMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |