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Note 14 - Deferred Compensation Plan (Details Textual) | Dec. 31, 2017 shares
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Deferred Compensation Plan Number Of Common Shares Credited To Account Balances | 175,449

X
- Definition Deferred compensation plan number of common shares credited to account balances. + References No definition available. + Details
Name: | mrtn_DeferredCompensationPlanNumberOfCommonSharesCreditedToAccountBalances
Namespace Prefix: | mrtn_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant