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Note 3 - Discontinued Operations - Results of Discontinued Operations (Details) (Parentheticals) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Transport Financial Services [Member] | Discontinued Operations, Held-for-sale [Member]
Disposal Group, Including Discontinued Operation, Allowance	$ 600	$ 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: