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Note 6 - Dividends	9 Months Ended
	Sep. 30, 2012
Dividends [Text Block]	(6)  Dividends In August 2010, we announced that our Board of Directors approved a regular cash dividend program to our stockholders, subject to approval each quarter.  Quarterly cash dividends of $0.02, $0.025 and $0.025 per share of common stock were paid in March, May and September 2012, respectively.

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- Definition

Disclosure of information related to dividends paid during the period.

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No definition available.

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Namespace Prefix:	mrtn_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration