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Note 10 - Commitments and Contingencies (Details Textual)	Mar. 31, 2017 USD ($)
Operating Leases, Future Minimum Payments Due	$ 348,000
Revenue Equipment Expenditure [Member]
Contractual Obligation, Future Minimum Payments Due, Remainder of Fiscal Year	85,900,000
Building Construction and Acquisition Expenditures [Member]
Contractual Obligation, Future Minimum Payments Due, Remainder of Fiscal Year	$ 578,000

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

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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=82846649&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=77902758&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: