3.10.0.1 html 214 300 1 true 66 0 false 4 false false R1.htm 000 - Document - Document And Entity Information Sheet http://www.marten.com/20181231/role/statement-document-and-entity-information Document And Entity Information Cover 1 false false R2.htm 001 - Statement - Consolidated Balance Sheets Sheet http://www.marten.com/20181231/role/statement-consolidated-balance-sheets- Consolidated Balance Sheets Statements 2 false false R3.htm 002 - Statement - Consolidated Balance Sheets (Parentheticals) Sheet http://www.marten.com/20181231/role/statement-consolidated-balance-sheets-parentheticals Consolidated Balance Sheets (Parentheticals) Statements 3 false false R4.htm 003 - Statement - Consolidated Statements of Operations Sheet http://www.marten.com/20181231/role/statement-consolidated-statements-of-operations Consolidated Statements of Operations Statements 4 false false R5.htm 004 - Statement - Consolidated Statements of Stockholders' Equity Sheet http://www.marten.com/20181231/role/statement-consolidated-statements-of-stockholders-equity Consolidated Statements of Stockholders' Equity Statements 5 false false R6.htm 005 - Statement - Consolidated Statements of Cash Flows Sheet http://www.marten.com/20181231/role/statement-consolidated-statements-of-cash-flows Consolidated Statements of Cash Flows Statements 6 false false R7.htm 006 - Disclosure - Note 1 - Summary of Significant Accounting Policies Sheet http://www.marten.com/20181231/role/statement-note-1-summary-of-significant-accounting-policies Note 1 - Summary of Significant Accounting Policies Notes 7 false false R8.htm 007 - Disclosure - Note 2 - Adoption of New Accounting Standard Sheet http://www.marten.com/20181231/role/statement-note-2-adoption-of-new-accounting-standard- Note 2 - Adoption of New Accounting Standard Notes 8 false false R9.htm 008 - Disclosure - Note 3 - Revenue and Business Segments Sheet http://www.marten.com/20181231/role/statement-note-3-revenue-and-business-segments Note 3 - Revenue and Business Segments Notes 9 false false R10.htm 009 - Disclosure - Note 4 - Details of Consolidated Balance Sheet Accounts Sheet http://www.marten.com/20181231/role/statement-note-4-details-of-consolidated-balance-sheet-accounts- Note 4 - Details of Consolidated Balance Sheet Accounts Notes 10 false false R11.htm 010 - Disclosure - Note 5 - Long-term Debt Sheet http://www.marten.com/20181231/role/statement-note-5-longterm-debt Note 5 - Long-term Debt Notes 11 false false R12.htm 011 - Disclosure - Note 6 - Related Party Transactions Sheet http://www.marten.com/20181231/role/statement-note-6-related-party-transactions Note 6 - Related Party Transactions Notes 12 false false R13.htm 012 - Disclosure - Note 7 - Income Taxes Sheet http://www.marten.com/20181231/role/statement-note-7-income-taxes Note 7 - Income Taxes Notes 13 false false R14.htm 013 - Disclosure - Note 8 - Earnings Per Common Share Sheet http://www.marten.com/20181231/role/statement-note-8-earnings-per-common-share- Note 8 - Earnings Per Common Share Notes 14 false false R15.htm 014 - Disclosure - Note 9 - Stock Split Sheet http://www.marten.com/20181231/role/statement-note-9-stock-split Note 9 - Stock Split Notes 15 false false R16.htm 015 - Disclosure - Note 10 - Share Repurchase Program Sheet http://www.marten.com/20181231/role/statement-note-10-share-repurchase-program- Note 10 - Share Repurchase Program Notes 16 false false R17.htm 016 - Disclosure - Note 11 - Dividends Sheet http://www.marten.com/20181231/role/statement-note-11-dividends Note 11 - Dividends Notes 17 false false R18.htm 017 - Disclosure - Note 12 - Third Amendment to Amended and Restated Certificate of Incorporation Sheet http://www.marten.com/20181231/role/statement-note-12-third-amendment-to-amended-and-restated-certificate-of-incorporation- Note 12 - Third Amendment to Amended and Restated Certificate of Incorporation Notes 18 false false R19.htm 018 - Disclosure - Note 13 - Equity Investment Sheet http://www.marten.com/20181231/role/statement-note-13-equity-investment Note 13 - Equity Investment Notes 19 false false R20.htm 019 - Disclosure - Note 14 - Employee Benefits Sheet http://www.marten.com/20181231/role/statement-note-14-employee-benefits- Note 14 - Employee Benefits Notes 20 false false R21.htm 020 - Disclosure - Note 15 - Excess Tax Benefit Reclassification Sheet http://www.marten.com/20181231/role/statement-note-15-excess-tax-benefit-reclassification Note 15 - Excess Tax Benefit Reclassification Notes 21 false false R22.htm 021 - Disclosure - Note 16 - Deferred Compensation Plan Sheet http://www.marten.com/20181231/role/statement-note-16-deferred-compensation-plan- Note 16 - Deferred Compensation Plan Notes 22 false false R23.htm 022 - Disclosure - Note 17 - Fair Value of Financial Instruments Sheet http://www.marten.com/20181231/role/statement-note-17-fair-value-of-financial-instruments Note 17 - Fair Value of Financial Instruments Notes 23 false false R24.htm 023 - Disclosure - Note 18 - Commitments and Contingencies Sheet http://www.marten.com/20181231/role/statement-note-18-commitments-and-contingencies Note 18 - Commitments and Contingencies Notes 24 false false R25.htm 024 - Disclosure - Note 19 - Quarterly Financial Data (Unaudited) Sheet http://www.marten.com/20181231/role/statement-note-19-quarterly-financial-data-unaudited Note 19 - Quarterly Financial Data (Unaudited) Notes 25 false false R26.htm 025 - Disclosure - Schedule II - Valuation and Qualifying Accounts and Reserves Sheet http://www.marten.com/20181231/role/statement-schedule-ii-valuation-and-qualifying-accounts-and-reserves Schedule II - Valuation and Qualifying Accounts and Reserves Notes 26 false false R27.htm 026 - Disclosure - Significant Accounting Policies (Policies) Sheet http://www.marten.com/20181231/role/statement-significant-accounting-policies-policies Significant Accounting Policies (Policies) Policies http://www.marten.com/20181231/role/statement-note-1-summary-of-significant-accounting-policies 27 false false R28.htm 027 - Disclosure - Note 1 - Summary of Significant Accounting Policies (Tables) Sheet http://www.marten.com/20181231/role/statement-note-1-summary-of-significant-accounting-policies-tables Note 1 - Summary of Significant Accounting Policies (Tables) Tables http://www.marten.com/20181231/role/statement-note-1-summary-of-significant-accounting-policies 28 false false R29.htm 028 - Disclosure - Note 2 - Adoption of New Accounting Standard (Tables) Sheet http://www.marten.com/20181231/role/statement-note-2-adoption-of-new-accounting-standard-tables Note 2 - Adoption of New Accounting Standard (Tables) Tables http://www.marten.com/20181231/role/statement-note-2-adoption-of-new-accounting-standard- 29 false false R30.htm 029 - Disclosure - Note 3 - Revenue and Business Segments (Tables) Sheet http://www.marten.com/20181231/role/statement-note-3-revenue-and-business-segments-tables Note 3 - Revenue and Business Segments (Tables) Tables http://www.marten.com/20181231/role/statement-note-3-revenue-and-business-segments 30 false false R31.htm 030 - Disclosure - Note 4 - Details of Consolidated Balance Sheet Accounts (Tables) Sheet http://www.marten.com/20181231/role/statement-note-4-details-of-consolidated-balance-sheet-accounts-tables Note 4 - Details of Consolidated Balance Sheet Accounts (Tables) Tables http://www.marten.com/20181231/role/statement-note-4-details-of-consolidated-balance-sheet-accounts- 31 false false R32.htm 031 - Disclosure - Note 7 - Income Taxes (Tables) Sheet http://www.marten.com/20181231/role/statement-note-7-income-taxes-tables Note 7 - Income Taxes (Tables) Tables http://www.marten.com/20181231/role/statement-note-7-income-taxes 32 false false R33.htm 032 - Disclosure - Note 8 - Earnings Per Common Share (Tables) Sheet http://www.marten.com/20181231/role/statement-note-8-earnings-per-common-share-tables Note 8 - Earnings Per Common Share (Tables) Tables http://www.marten.com/20181231/role/statement-note-8-earnings-per-common-share- 33 false false R34.htm 033 - Disclosure - Note 14 - Employee Benefits (Tables) Sheet http://www.marten.com/20181231/role/statement-note-14-employee-benefits-tables Note 14 - Employee Benefits (Tables) Tables http://www.marten.com/20181231/role/statement-note-14-employee-benefits- 34 false false R35.htm 034 - Disclosure - Note 19 - Quarterly Financial Data (Unaudited) (Tables) Sheet http://www.marten.com/20181231/role/statement-note-19-quarterly-financial-data-unaudited-tables Note 19 - Quarterly Financial Data (Unaudited) (Tables) Tables http://www.marten.com/20181231/role/statement-note-19-quarterly-financial-data-unaudited 35 false false R36.htm 035 - Disclosure - Schedule II - Valuation and Qualifying Accounts and Reserves (Tables) Sheet http://www.marten.com/20181231/role/statement-schedule-ii-valuation-and-qualifying-accounts-and-reserves-tables Schedule II - Valuation and Qualifying Accounts and Reserves (Tables) Tables http://www.marten.com/20181231/role/statement-schedule-ii-valuation-and-qualifying-accounts-and-reserves 36 false false R37.htm 036 - Disclosure - Note 1 - Summary of Significant Accounting Policies (Details Textual) Sheet http://www.marten.com/20181231/role/statement-note-1-summary-of-significant-accounting-policies-details-textual Note 1 - Summary of Significant Accounting Policies (Details Textual) Details http://www.marten.com/20181231/role/statement-note-1-summary-of-significant-accounting-policies-tables 37 false false R38.htm 037 - Disclosure - Note 1 - Summary of Significant Accounting Policies - Estimated Useful Lives (Details) Sheet http://www.marten.com/20181231/role/statement-note-1-summary-of-significant-accounting-policies-estimated-useful-lives-details Note 1 - Summary of Significant Accounting Policies - Estimated Useful Lives (Details) Details 38 false false R39.htm 038 - Disclosure - Note 2 - Adoption of New Accounting Standard (Details Textual) Sheet http://www.marten.com/20181231/role/statement-note-2-adoption-of-new-accounting-standard-details-textual Note 2 - Adoption of New Accounting Standard (Details Textual) Details http://www.marten.com/20181231/role/statement-note-2-adoption-of-new-accounting-standard-tables 39 false false R40.htm 039 - Disclosure - Note 2 - Adoption of New Accounting Standard - Cumulative Effect of Adjustments for New Accounting Pronouncements on Consolidated Condensed Balance Sheet (Details) Sheet http://www.marten.com/20181231/role/statement-note-2-adoption-of-new-accounting-standard-cumulative-effect-of-adjustments-for-new-accounting-pronouncements-on-consolidated-condensed-balance-sheet-details Note 2 - Adoption of New Accounting Standard - Cumulative Effect of Adjustments for New Accounting Pronouncements on Consolidated Condensed Balance Sheet (Details) Details 40 false false R41.htm 040 - Disclosure - Note 2 - Adoption of New Accounting Standard - Impact of New Standard on Consolidated Condensed Balance Sheet and Statements of Operations (Details) Sheet http://www.marten.com/20181231/role/statement-note-2-adoption-of-new-accounting-standard-impact-of-new-standard-on-consolidated-condensed-balance-sheet-and-statements-of-operations-details Note 2 - Adoption of New Accounting Standard - Impact of New Standard on Consolidated Condensed Balance Sheet and Statements of Operations (Details) Details 41 false false R42.htm 041 - Disclosure - Note 3 - Revenue and Business Segments (Details Textual) Sheet http://www.marten.com/20181231/role/statement-note-3-revenue-and-business-segments-details-textual Note 3 - Revenue and Business Segments (Details Textual) Details http://www.marten.com/20181231/role/statement-note-3-revenue-and-business-segments-tables 42 false false R43.htm 042 - Disclosure - Note 3 - Revenue and Business Segments - Operating Revenue and Operating Income by Segment (Details) Sheet http://www.marten.com/20181231/role/statement-note-3-revenue-and-business-segments-operating-revenue-and-operating-income-by-segment-details Note 3 - Revenue and Business Segments - Operating Revenue and Operating Income by Segment (Details) Details 43 false false R44.htm 043 - Disclosure - Note 4 - Details of Consolidated Balance Sheet Accounts - Prepaid Expenses and Other (Details) Sheet http://www.marten.com/20181231/role/statement-note-4-details-of-consolidated-balance-sheet-accounts-prepaid-expenses-and-other-details Note 4 - Details of Consolidated Balance Sheet Accounts - Prepaid Expenses and Other (Details) Details 44 false false R45.htm 044 - Disclosure - Note 4 - Details of Consolidated Balance Sheet Accounts - Accrued Liabilities (Details) Sheet http://www.marten.com/20181231/role/statement-note-4-details-of-consolidated-balance-sheet-accounts-accrued-liabilities-details Note 4 - Details of Consolidated Balance Sheet Accounts - Accrued Liabilities (Details) Details 45 false false R46.htm 045 - Disclosure - Note 5 - Long-term Debt (Details Textual) Sheet http://www.marten.com/20181231/role/statement-note-5-longterm-debt-details-textual Note 5 - Long-term Debt (Details Textual) Details http://www.marten.com/20181231/role/statement-note-5-longterm-debt 46 false false R47.htm 046 - Disclosure - Note 6 - Related Party Transactions (Details Textual) Sheet http://www.marten.com/20181231/role/statement-note-6-related-party-transactions-details-textual Note 6 - Related Party Transactions (Details Textual) Details http://www.marten.com/20181231/role/statement-note-6-related-party-transactions 47 false false R48.htm 047 - Disclosure - Note 7 - Income Taxes (Details Textual) Sheet http://www.marten.com/20181231/role/statement-note-7-income-taxes-details-textual Note 7 - Income Taxes (Details Textual) Details http://www.marten.com/20181231/role/statement-note-7-income-taxes-tables 48 false false R49.htm 048 - Disclosure - Note 7 - Income Taxes - Components of Provision for Income Taxes (Details) Sheet http://www.marten.com/20181231/role/statement-note-7-income-taxes-components-of-provision-for-income-taxes-details Note 7 - Income Taxes - Components of Provision for Income Taxes (Details) Details 49 false false R50.htm 049 - Disclosure - Note 7 - Income Taxes - Federal Income Tax Reconciled to the Effective Income Tax Rate (Details) Sheet http://www.marten.com/20181231/role/statement-note-7-income-taxes-federal-income-tax-reconciled-to-the-effective-income-tax-rate-details Note 7 - Income Taxes - Federal Income Tax Reconciled to the Effective Income Tax Rate (Details) Details 50 false false R51.htm 050 - Disclosure - Note 7 - Income Taxes - Net Deferred Tax Liability (Details) Sheet http://www.marten.com/20181231/role/statement-note-7-income-taxes-net-deferred-tax-liability-details Note 7 - Income Taxes - Net Deferred Tax Liability (Details) Details 51 false false R52.htm 051 - Disclosure - Note 8 - Earnings Per Common Share (Details Textual) Sheet http://www.marten.com/20181231/role/statement-note-8-earnings-per-common-share-details-textual Note 8 - Earnings Per Common Share (Details Textual) Details http://www.marten.com/20181231/role/statement-note-8-earnings-per-common-share-tables 52 false false R53.htm 052 - Disclosure - Note 8 - Earnings Per Common Share - Basic and Diluted Earnings Per Common Share (Details) Sheet http://www.marten.com/20181231/role/statement-note-8-earnings-per-common-share-basic-and-diluted-earnings-per-common-share-details Note 8 - Earnings Per Common Share - Basic and Diluted Earnings Per Common Share (Details) Details 53 false false R54.htm 053 - Disclosure - Note 9 - Stock Split (Details Textual) Sheet http://www.marten.com/20181231/role/statement-note-9-stock-split-details-textual Note 9 - Stock Split (Details Textual) Details http://www.marten.com/20181231/role/statement-note-9-stock-split 54 false false R55.htm 054 - Disclosure - Note 10 - Share Repurchase Program (Details Textual) Sheet http://www.marten.com/20181231/role/statement-note-10-share-repurchase-program-details-textual Note 10 - Share Repurchase Program (Details Textual) Details http://www.marten.com/20181231/role/statement-note-10-share-repurchase-program- 55 false false R56.htm 055 - Disclosure - Note 11 - Dividends (Details Textual) Sheet http://www.marten.com/20181231/role/statement-note-11-dividends-details-textual Note 11 - Dividends (Details Textual) Details http://www.marten.com/20181231/role/statement-note-11-dividends 56 false false R57.htm 056 - Disclosure - Note 12 - Third Amendment to Amended and Restated Certificate of Incorporation (Details Textual) Sheet http://www.marten.com/20181231/role/statement-note-12-third-amendment-to-amended-and-restated-certificate-of-incorporation-details-textual Note 12 - Third Amendment to Amended and Restated Certificate of Incorporation (Details Textual) Details http://www.marten.com/20181231/role/statement-note-12-third-amendment-to-amended-and-restated-certificate-of-incorporation- 57 false false R58.htm 057 - Disclosure - Note 13 - Equity Investment (Details Textual) Sheet http://www.marten.com/20181231/role/statement-note-13-equity-investment-details-textual Note 13 - Equity Investment (Details Textual) Details http://www.marten.com/20181231/role/statement-note-13-equity-investment 58 false false R59.htm 058 - Disclosure - Note 14 - Employee Benefits (Details Textual) Sheet http://www.marten.com/20181231/role/statement-note-14-employee-benefits-details-textual Note 14 - Employee Benefits (Details Textual) Details http://www.marten.com/20181231/role/statement-note-14-employee-benefits-tables 59 false false R60.htm 059 - Disclosure - Note 14 - Employee Benefits - Stock Options Valuation Assumptions (Details) Sheet http://www.marten.com/20181231/role/statement-note-14-employee-benefits-stock-options-valuation-assumptions-details Note 14 - Employee Benefits - Stock Options Valuation Assumptions (Details) Details 60 false false R61.htm 060 - Disclosure - Note 14 - Employee Benefits - Option Activity (Details) Sheet http://www.marten.com/20181231/role/statement-note-14-employee-benefits-option-activity-details Note 14 - Employee Benefits - Option Activity (Details) Details 61 false false R62.htm 061 - Disclosure - Note 14 - Employee Benefits - Non-vested Option Awards Activity (Details) Sheet http://www.marten.com/20181231/role/statement-note-14-employee-benefits-nonvested-option-awards-activity-details Note 14 - Employee Benefits - Non-vested Option Awards Activity (Details) Details 62 false false R63.htm 062 - Disclosure - Note 14 - Employee Benefits - Non-vested Performance Unit Award Activity (Details) Sheet http://www.marten.com/20181231/role/statement-note-14-employee-benefits-nonvested-performance-unit-award-activity-details Note 14 - Employee Benefits - Non-vested Performance Unit Award Activity (Details) Details 63 false false R64.htm 063 - Disclosure - Note 15 - Excess Tax Benefit Reclassification (Details Textual) Sheet http://www.marten.com/20181231/role/statement-note-15-excess-tax-benefit-reclassification-details-textual Note 15 - Excess Tax Benefit Reclassification (Details Textual) Details http://www.marten.com/20181231/role/statement-note-15-excess-tax-benefit-reclassification 64 false false R65.htm 064 - Disclosure - Note 16 - Deferred Compensation Plan (Details Textual) Sheet http://www.marten.com/20181231/role/statement-note-16-deferred-compensation-plan-details-textual Note 16 - Deferred Compensation Plan (Details Textual) Details http://www.marten.com/20181231/role/statement-note-16-deferred-compensation-plan- 65 false false R66.htm 065 - Disclosure - Note 18 - Commitments and Contingencies (Details Textual) Sheet http://www.marten.com/20181231/role/statement-note-18-commitments-and-contingencies-details-textual Note 18 - Commitments and Contingencies (Details Textual) Details http://www.marten.com/20181231/role/statement-note-18-commitments-and-contingencies 66 false false R67.htm 066 - Disclosure - Note 19 - Quarterly Financial Data (Unaudited) (Details Textual) Sheet http://www.marten.com/20181231/role/statement-note-19-quarterly-financial-data-unaudited-details-textual Note 19 - Quarterly Financial Data (Unaudited) (Details Textual) Details http://www.marten.com/20181231/role/statement-note-19-quarterly-financial-data-unaudited-tables 67 false false R68.htm 067 - Disclosure - Note 19 - Quarterly Financial Data (Unaudited) - Quarterly Results of Operations (Details) Sheet http://www.marten.com/20181231/role/statement-note-19-quarterly-financial-data-unaudited-quarterly-results-of-operations-details Note 19 - Quarterly Financial Data (Unaudited) - Quarterly Results of Operations (Details) Details http://www.marten.com/20181231/role/statement-note-19-quarterly-financial-data-unaudited-tables 68 false false R69.htm 068 - Disclosure - Schedule II - Valuation and Qualifying Accounts and Reserves - Valuation Allowances and Reserves (Details) Sheet http://www.marten.com/20181231/role/statement-schedule-ii-valuation-and-qualifying-accounts-and-reserves-valuation-allowances-and-reserves-details Schedule II - Valuation and Qualifying Accounts and Reserves - Valuation Allowances and Reserves (Details) Details 69 false false All Reports Book All Reports mrtn-20181231.xml mrtn-20181231.xsd mrtn-20181231_cal.xml mrtn-20181231_def.xml mrtn-20181231_lab.xml mrtn-20181231_pre.xml http://xbrl.sec.gov/dei/2018-01-31 http://xbrl.sec.gov/country/2017-01-31 http://fasb.org/us-gaap/2018-01-31 http://fasb.org/srt/2018-01-31 true true