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Note 9 - Leases (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Impairment of Long-Lived Assets to be Disposed of | $ 26,569 | $ 0 | $ 0
Revenue Equipment Rentals and Purchased Transportation | 222,705 | 204,655 | $ 183,645
Operating Lease, Right-of-Use Asset | 37,400 | 58,800 |
Finance Lease, Right-of-Use Asset, after Accumulated Amortization, Total | 29,400 | $ 35,600 |
Leased Office Facility [Member] |  |  |
Impairment of Long-Lived Assets to be Disposed of | 2,200 |  |
Revenue Equipment Rentals and Purchased Transportation | $ 800 |  |

X
- Definition The total costs of purchased transportation and transportation-related services, costs of independent contractors, and rental expense incurred for leased assets including furniture and equipment and real estate during the reporting period. + References No definition available. + Details
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Namespace Prefix: | cvlg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount, after accumulated amortization, of right-of-use asset from finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
Name: | us-gaap_FinanceLeaseRightOfUseAsset
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2611-110228 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
Period Type: | duration

X
- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
Name: | us-gaap_OperatingLeaseRightOfUseAsset
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=cvlg_LeasedOfficeFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |