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Note 12 - Deferred Compensation Plan (Details)	Dec. 31, 2014
Postemployment Benefits [Abstract]
Deferred Compensation Plan, Number of Common Shares Credited to Account Balances	70,514mrtn_DeferredCompensationPlanNumberOfCommonSharesCreditedToAccountBalances

X

- Definition

Number of common shares credit to account balances within the deferred compensation plan as of the reported date.

+ References

No definition available.

+ Details

Name:	mrtn_DeferredCompensationPlanNumberOfCommonSharesCreditedToAccountBalances
Namespace Prefix:	mrtn_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_PostemploymentBenefitsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration