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Note 11 - Commitments and Contingencies (Details Textual)	Jun. 30, 2015 USD ($)
Revenue Equipment Expenditure [Member]
Contractual Obligation, Future Minimum Payments Due, Remainder of Fiscal Year	$ 88,200,000
Building Construction and Acquisition Expenditures [Member]
Contractual Obligation, Future Minimum Payments Due, Remainder of Fiscal Year	3,200,000
Operating Leases, Future Minimum Payments Due	$ 650,000

X

- Definition

Amount of contractual obligation maturing in the remainder of the fiscal year following the latest fiscal year ended.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 840



-SubTopic 10



-Section 55



-Paragraph 40



-Subparagraph (Note 3)



-URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697



Reference 2: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 840



-SubTopic 20



-Section 50



-Paragraph 2



-Subparagraph (a)



-URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717

+ Details

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

X

- Details

Name:	us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis=mrtn_RevenueEquipmentExpenditureMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis=mrtn_BuildingConstructionAndAcquisitionExpendituresMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: