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Note 3 - Discontinued Operations - Results of Discontinued Operations (Details) (Parentheticals) - USD ($) $ in Thousands | Sep. 30, 2020 | Jul. 08, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Transport Financial Services [Member] | Discontinued Operations, Held-for-sale [Member] |  |  |
Disposal Group, Including Discontinued Operation, Allowance | $ 0 | $ 5,400 | $ 408

X
- Definition Amount of allowance on accounts receivable, attributable to disposal group held for sale or disposed of, classified as current. + References No definition available. + Details
Name: | cvlg_DisposalGroupIncludingDiscontinuedOperationAllowance
Namespace Prefix: | cvlg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=cvlg_TransportFinancialServicesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DisposalGroupClassificationAxis=us-gaap_DiscontinuedOperationsHeldforsaleMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |