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Note 12 - Employee Benefit Plans - Summary of Accumulated Benefit Obligation (Details) $ in Thousands	Dec. 31, 2022 USD ($)
Defined Benefit Plan, Accumulated Benefit Obligation	$ 226
Aggregate market value	$ 220

X

- Definition

Amount of aggregate market value of benefits attributed to employee service rendered

+ References

No definition available.

+ Details

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

X

- Definition

Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (e)
-URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920

+ Details

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