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Note 10 - Deferred Compensation Plan (Detail) | Dec. 31, 2012
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Deferred Compensation Plan, Number of Common Shares Credited to Account Balances | 35,040.2

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- 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