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Note 15 - Subsequent Events (Details Textual) - USD ($) $ in Millions	Oct. 23, 2020	Oct. 31, 2020	Sep. 30, 2020
Subsequent Event [Member] | Transport Financial Services [Member] | Discontinued Operations, Held-for-sale [Member]
Disposal Group, Including Discontinued Operation, Consideration Returned upon Settlement		$ 28.1
Lenders [Member]
Line of Credit Facility, Maximum Borrowing Capacity			$ 95.0
Lenders [Member] | Subsequent Event [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 110.0
Line of Credit Facility, Improved Pricing, Basis Point	0.25%

X

- Definition

Represents amount of consideration returned upon settlement in a disposal group transaction.

+ References

No definition available.

+ Details

Name:	cvlg_DisposalGroupIncludingDiscontinuedOperationConsiderationReturnedUponSettlement
Namespace Prefix:	cvlg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Represents the improved pricing in basis point.

+ References

No definition available.

+ Details

Name:	cvlg_LineOfCreditFacilityImprovedPricingBasisPoint
Namespace Prefix:	cvlg_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

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:

X

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=cvlg_LendersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: