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Note 5 - Segment Information (Details Textual) | 3 Months Ended | 9 Months Ended
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Sep. 30, 2021 | Jun. 30, 2020 | Sep. 30, 2021
Number of Asset-based Operating Fleets Aggregated in a Segment |  | 4 |
Number of Reportable Segments | 4 |  | 4

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- Definition The number of asset-based operating fleets that are aggregated in a segment because they have similar economic characteristics and meet the aggregation criteria. + References No definition available. + Details
Name: | cvlg_NumberOfAssetbasedOperatingFleetsAggregatedInASegment
Namespace Prefix: | cvlg_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8672-108599 + Details
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration