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Note 3 - Long-term Debt (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Note 3 - Long-term Debt (Details) [Line Items] |  |  |
Long-term Line of Credit | $ 24,400,000 us-gaap_LineOfCredit | $ 0 us-gaap_LineOfCredit |
Letters of Credit Outstanding, Amount | 9,200,000 us-gaap_LettersOfCreditOutstandingAmount |  |
Line of Credit Facility, Remaining Borrowing Capacity | 16,400,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity |  |
Line of Credit Facility, Dividend Restrictions, Percentage of Net Income Limit | 25.00%mrtn_LineOfCreditFacilityDividendRestrictionsPercentageOfNetIncomeLimit |  |
Common Stock, Dividends, Per Share, Cash Paid (in Dollars per share) | $ 0.10 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.083 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.563 us-gaap_CommonStockDividendsPerShareCashPaid
Special Dividend [Member] |  |  |
Note 3 - Long-term Debt (Details) [Line Items] |  |  |
Common Stock, Dividends, Per Share, Cash Paid (in Dollars per share) |  |  | $ 0.50 us-gaap_CommonStockDividendsPerShareCashPaid / us-gaap_DividendsAxis = mrtn_SpecialDividendMember
Credit Facility [Member] |  |  |
Note 3 - Long-term Debt (Details) [Line Items] |  |  |
Long-term Debt, Weighted Average Interest Rate | 0.84%us-gaap_LongtermDebtWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis = mrtn_CreditFacilityMember |  |
Minimum [Member] |  |  |
Note 3 - Long-term Debt (Details) [Line Items] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | 50,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Maximum [Member] |  |  |
Note 3 - Long-term Debt (Details) [Line Items] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 75,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_RangeAxis = us-gaap_MaximumMember |  |

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- Definition Represents the dividend limit as a percentage of net income as required by the terms of the credit facility. + References No definition available. + Details
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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: 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 + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Weighted average interest rate of long-term debt outstanding. + References No definition available. + Details
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