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Note 10 - Sale of Intermodal Business Assets (Details Textual) - Intermodal Business Assets [Member] $ in Millions	Sep. 30, 2025 USD ($)
Refrigerated Containers	1,200
Disposal Group, Including Discontinued Operation, Consideration	$ 51.8

X

- Definition

The number of refrigerated containers.

+ References

No definition available.

+ Details

Name:	mrtn_RefrigeratedContainers
Namespace Prefix:	mrtn_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation.

+ References

No definition available.

+ Details

Name:	us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=mrtn_IntermodalBusinessAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: