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Note 1 - Significant Accounting Policies (Details Textual) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2024	Jun. 30, 2025
Depreciation, Increase Decrease	$ 2.6
Tractors [Member]
Property, Plant and Equipment, Useful Life (Year)		5 years
Tractors [Member] | Minimum [Member]
Property, Plant and Equipment, Salvage Value, Percentage		0.00%
Tractors [Member] | Maximum [Member]
Property, Plant and Equipment, Salvage Value, Percentage		35.00%
Refrigerated Trailers [Member]
Property, Plant and Equipment, Useful Life (Year)		7 years
Dry Van Trailers [Member]
Property, Plant and Equipment, Useful Life (Year)		10 years
Dry Van Trailers [Member] | Minimum [Member]
Property, Plant and Equipment, Salvage Value, Percentage		20.00%
Dry Van Trailers [Member] | Maximum [Member]
Property, Plant and Equipment, Salvage Value, Percentage		25.00%

X

- Definition

Represents the increase or decrease in depreciation amount for the period.

+ References

No definition available.

+ Details

Name:	cvti_DepreciationIncreaseDecrease
Namespace Prefix:	cvti_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Stated as a percentage, the estimated or actual value of the asset at the end of its useful life or when it is no longer serviceable (cannot be used for its original purpose) divided by its [historical] capitalized cost.

+ References

No definition available.

+ Details

Name:	us-gaap_PropertyPlantAndEquipmentSalvageValuePercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

Name:	us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=cvti_TractorsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=cvti_RefrigeratedTrailersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=cvti_DryVanTrailersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: