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Note 9 - Commitments and Contingencies (Details Textual) - USD ($)	Sep. 30, 2024	Jun. 01, 2023	Jun. 01, 2022
Lessee, Operating Lease, Liability, to be Paid, Total	$ 705,000
Auto Liability Claim [Member] | Minimum [Member]
Liability Claim, Amount	10,000,000
Auto Liability Claim [Member] | Maximum [Member]
Liability Claim, Amount	20,000,000
Auto Liability Claim [Member] | Uninsured Risk [Member]
Loss Contingency Range Possible Loss Per Claim	2,000,000	$ 1,000,000	$ 1,000,000
Claim Limit, Aggregate Cost	5,000,000
Workers Compensation Liability Claim [Member] | Uninsured Risk [Member]
Loss Contingency Range Possible Loss Per Claim	750,000
Capital Addition Purchase Commitments [Member] | Revenue Equipment [Member]
Purchase Obligation, to be Paid, Remainder of Fiscal Year	36,200,000
Purchase Obligation, to be Paid, Year One	$ 73,600,000

X

- Definition

The maximum amount an insurer will remember policy holders for covered losses for claims.

+ References

No definition available.

+ Details

Name:	mrtn_ClaimLimitAggregateCost
Namespace Prefix:	mrtn_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The claim amount that can be used for the aggregate value of annual claims.

+ References

No definition available.

+ Details

Name:	mrtn_LiabilityClaimAmount
Namespace Prefix:	mrtn_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Amount of possible loss from each claim incurred.

+ References

No definition available.

+ Details

Name:	mrtn_LossContingencyRangePossibleLossPerClaim
Namespace Prefix:	mrtn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of lessee's undiscounted obligation for lease payment for operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478964/842-20-50-6

+ Details

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

X

- Definition

Amount of purchase arrangement to be paid in next fiscal year following current fiscal year. Includes, but is not limited to, recorded and unrecorded purchase obligations, long-term purchase commitment, and short-term purchase commitment. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

No definition available.

+ Details

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

X

- Definition

Amount of purchase arrangement to be paid in remainder of current fiscal year. Includes, but is not limited to, recorded and unrecorded purchase obligations, long-term purchase commitment, and short-term purchase commitment.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_GuaranteeObligationsByNatureAxis=mrtn_AutoLiabilityClaimMember
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_LossContingenciesByNatureOfContingencyAxis=us-gaap_UninsuredRiskMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_GuaranteeObligationsByNatureAxis=mrtn_WorkersCompensationLiabilityClaimMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis=us-gaap_CapitalAdditionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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