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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: |