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Note 11 - Employee Benefits (Details) (USD $)	12 Months Ended			1 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	May 31, 2014	May 31, 2013	May 31, 2012	Aug. 31, 2011	Aug. 31, 2010
Note 11 - Employee Benefits (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares)	2,850,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Forfeiture Rate of Unvested Outstanding Awards	1.25%mrtn_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedForfeitureRateOfUnvestedOutstandingAwards
Allocated Share-based Compensation Expense	$ 921,000us-gaap_AllocatedShareBasedCompensationExpense	$ 1,084,000us-gaap_AllocatedShareBasedCompensationExpense	$ 1,225,000us-gaap_AllocatedShareBasedCompensationExpense
Allocated Share-based Compensation Expense, Net of Tax	571,000us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax	672,000us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax	759,000us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
Allocated Share-based Compensation Expense, Net of Tax, Amount Per Basic and Diluted Share (in Dollars per share)	$ 0.02mrtn_AllocatedShareBasedCompensationExpenseNetOfTaxAmountPerBasicAndDilutedShare	$ 0.02mrtn_AllocatedShareBasedCompensationExpenseNetOfTaxAmountPerBasicAndDilutedShare	$ 0.02mrtn_AllocatedShareBasedCompensationExpenseNetOfTaxAmountPerBasicAndDilutedShare
Excess Tax Benefit from Share-based Compensation, Financing Activities	115,000us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	165,000us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	336,000us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number (in Shares)	977,867us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	1,015,759us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	3 years 73 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value	7,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in Shares)	695,317us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	2 years 146 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value	5,700,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	761,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	915,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	1,400,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
Proceeds from Stock Options Exercised	1,200,000us-gaap_ProceedsFromStockOptionsExercised	1,100,000us-gaap_ProceedsFromStockOptionsExercised	968,000us-gaap_ProceedsFromStockOptionsExercised
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value	541,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1	636,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1	751,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	35.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	6.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Defined Contribution Plan, Employers Matching Contribution, Annual Vesting Percentage	20.00%us-gaap_DefinedContributionPlanEmployersMatchingContributionAnnualVestingPercentage
Defined Contribution Plan, Cost Recognized	1,500,000us-gaap_DefinedContributionPlanCostRecognized	1,400,000us-gaap_DefinedContributionPlanCostRecognized	909,000us-gaap_DefinedContributionPlanCostRecognized
Participants Less than 50 Years Old [Member]
Note 11 - Employee Benefits (Details) [Line Items]
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Amount	17,500us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeeAmount / us-gaap_DefinedContributionPlanTypeAxis = mrtn_ParticipantsLessThan50YearsOldMember
Participants Over 50 Years Old [Member]
Note 11 - Employee Benefits (Details) [Line Items]
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Amount	23,000us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeeAmount / us-gaap_DefinedContributionPlanTypeAxis = mrtn_ParticipantsOver50YearsOldMember
Employee Stock Option [Member] | Awards Paid to Employees Upon Vesting [Member]
Note 11 - Employee Benefits (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted (in Shares)				11,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_VestingAxis = mrtn_AwardsPaidToEmployeesUponVestingMember
Employee Stock Option [Member] | Two Thousand and Five Plan [Member]
Note 11 - Employee Benefits (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	1 year
Share-based Compensation Arrangement by Share-based Payment Award, Annual Percentage of Award which Vests	20.00%mrtn_ShareBasedCompensationArrangementByShareBasedPaymentAwardAnnualPercentageOfAwardWhichVests / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = mrtn_TwoThousandAndFivePlanMember
Share-based Compensation Arrangement by Share-based Payment Award Number of Shares Reserved for Issuance under Awards Outstanding (in Shares)	977,867mrtn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesReservedForIssuanceUnderAwardsOutstanding / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = mrtn_TwoThousandAndFivePlanMember
Performance Shares [Member] | One Half of Awards Paid Immediately Upon Vesting and One Half Credited to Employees' Accounts [Member]
Note 11 - Employee Benefits (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted (in Shares)				36,400us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_VestingAxis = mrtn_OneHalfOfAwardsPaidImmediatelyUponVestingAndOneHalfCreditedToEmployeesAccountsMember	62,550us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_VestingAxis = mrtn_OneHalfOfAwardsPaidImmediatelyUponVestingAndOneHalfCreditedToEmployeesAccountsMember	59,250us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_VestingAxis = mrtn_OneHalfOfAwardsPaidImmediatelyUponVestingAndOneHalfCreditedToEmployeesAccountsMember	62,400us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_VestingAxis = mrtn_OneHalfOfAwardsPaidImmediatelyUponVestingAndOneHalfCreditedToEmployeesAccountsMember
Performance Shares [Member] | Two Thousand and Five Plan [Member]
Note 11 - Employee Benefits (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award Number of Shares Reserved for Issuance under Awards Outstanding (in Shares)	226,616mrtn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesReservedForIssuanceUnderAwardsOutstanding / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_PlanNameAxis = mrtn_TwoThousandAndFivePlanMember
Performance Shares [Member]
Note 11 - Employee Benefits (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period								5 years
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted (in Shares)								95,100us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember
Share-based Compensation Arrangement by Share-based Payment Awards, Annual Service Vesting Percentage								5.00%mrtn_ShareBasedCompensationArrangementByShareBasedPaymentAwardsAnnualServiceVestingPercentage / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember
Average Annual Earnings Percentage Increase, Goal of Share-based Compensation Awards								15.00%mrtn_AverageAnnualEarningsPercentageIncreaseGoalOfShareBasedCompensationAwards / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value	218,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember
Unvested Service Based Option Awards [Member]
Note 11 - Employee Benefits (Details) [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	1,400,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = mrtn_UnvestedServiceBasedOptionAwardsMember
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	3 years 109 days
Unvested Performance Unit Awards [Member]
Note 11 - Employee Benefits (Details) [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	2,200,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = mrtn_UnvestedPerformanceUnitAwardsMember
Service Based Options [Member]
Note 11 - Employee Benefits (Details) [Line Items]
Stock Granted, Value, Share-based Compensation, Gross	$ 475,000us-gaap_StockGrantedDuringPeriodValueSharebasedCompensationGross / us-gaap_AwardTypeAxis = mrtn_ServiceBasedOptionsMember	$ 953,000us-gaap_StockGrantedDuringPeriodValueSharebasedCompensationGross / us-gaap_AwardTypeAxis = mrtn_ServiceBasedOptionsMember	$ 695,000us-gaap_StockGrantedDuringPeriodValueSharebasedCompensationGross / us-gaap_AwardTypeAxis = mrtn_ServiceBasedOptionsMember
Minimum [Member] | Two Thousand and Five Plan [Member]
Note 11 - Employee Benefits (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	7 years
Maximum [Member] | Two Thousand and Five Plan [Member]
Note 11 - Employee Benefits (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	10 years

X

- Definition

The amount of expense, net of income tax, on a per basic and diluted share basis, recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Shares reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Annual service vesting percentage of share-based compensation awards.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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The amount of expense, net of income tax, recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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The amount of the cost recognized during the period for defined contribution plans.

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Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

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Maximum amount the employee may contribute to a defined contribution plan.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.

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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Net number of non-option equity instruments granted to participants.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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- Definition

Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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