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Note 6 - Dividends (Details Textual) - $ / shares	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Paid Quarterly [Member]
Common Stock, Dividends, Per Share, Declared	$ 0.025	$ 0.025
Line Of Credit Facility Dividend Restrictions Percentage Of Net Income Limit	25.00%

X

- Definition

Line of credit facility dividend restrictions percentage of net income limit.

+ References

No definition available.

+ Details

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Namespace Prefix:	mrtn_
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Period Type:	duration

X

- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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Period Type:	duration

X

- Details

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Namespace Prefix:
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Period Type: