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