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Note 10 - Commitments and Contingencies (Details Textual) - USD ($) $ in Millions	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019
Insurance Policy Primary Occurence Limit	$ 9.0	$ 9.0	$ 10.0
Insurance Policy Excess Coverage	$ 1.0	1.0	$ 10.0
Letters of Credit Outstanding, Amount		$ 36.7		$ 35.2

X

- Definition

Represents the excess coverage from the insurance policy.

+ References

No definition available.

+ Details

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

X

- Definition

The policy retains the first amount for the primary layer of the auto liability program.

+ References

No definition available.

+ Details

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

X

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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