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Note 5 - Segment Information (Details Textual)	3 Months Ended
	Mar. 31, 2021	Jun. 30, 2020
Number of Asset-based Operating Fleets Aggregated in a Segment		4
Number of Reportable Segments	4

X

- 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

X

- 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=120311839&loc=d3e8672-108599

+ Details

Name:	us-gaap_NumberOfReportableSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration