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Note 11 - Equity Investment (Details Textual) - M W L [Member] - USD ($) $ in Millions |  | 10 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 31, 2019 | Oct. 31, 2019 | Dec. 31, 2018
Equity Method Investment, Ownership Percentage | 45.00% | 45.00% |
Equity Method Investment, Amount Sold | $ 1.3 |  |
Equity Method Investment, Ownership Percentage by Non-related Party | 55.00% | 55.00% |
Revenue from Related Parties |  | $ 2.2 | $ 5.5

X
- Definition The percentage of ownership by a non-related party of common stock or equity participation in the investee accounted for under the equity method of accounting. + References No definition available. + Details
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Namespace Prefix: | mrtn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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Balance Type: | na
Period Type: | instant

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- Definition Amount of the entity's equity method investment which has been sold. + References No definition available. + Details
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- Definition Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07.1(c)) -URI http://asc.fasb.org/extlink&oid=120401555&loc=SL114874292-224272 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 + Details
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Balance Type: | credit
Period Type: | duration

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- Details
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