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Schedule II - Valuation and Qualifying Accounts and Reserves | 12 Months Ended
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Dec. 31, 2017
Notes to Financial Statements |
Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] | SCHEDULE II MARTEN TRANSPORT, LTD. Valuation and Qualifying Accounts and Reserves (In thousands)
|  | Balance at |  |  | Charged to |  |  |  |  |  |  |  |  |
|  | Beginning of |  |  | Costs and |  |  |  |  |  |  | Balance at |
Description |  | Year |  |  | Expenses |  |  | Deductions |  |  | End of Year |
Insurance and claims accruals: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Year ended December 31, 201 7 |  | $ | 19,440 |  |  | $ | 53,609 |  |  | $ | (46,872 | ) (1) |  | $ | 26,177 |
Year ended December 31, 201 6 |  |  | 16,235 |  |  |  | 49,614 |  |  |  | (46,409 | ) (1) |  |  | 19,440 |
Year ended December 31, 201 5 |  |  | 13,998 |  |  |  | 45,271 |  |  |  | (43,034 | ) (1) |  |  | 16,235 |
Allowance for doubtful accounts: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ye ar ended December 31, 2017 |  |  | 275 |  |  |  | 33 |  |  |  | (8 | ) (2) |  |  | 300 |
Year ended December 31, 201 6 |  |  | 305 |  |  |  | 88 |  |  |  | (118 | ) (2) |  |  | 275 |
Year ended December 31, 201 5 |  |  | 475 |  |  |  | 59 |  |  |  | (229 | ) (2) |  |  | 305 |
( 1 ) | Claims payments
( 2 ) | Write-off of bad debts, net of recoveries
See report of independent registered public accounting firm.

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- Definition The entire disclosure for any allowance and reserve accounts (their beginning and ending balances, as well as a reconciliation by type of activity during the period). Alternatively, disclosure of the required information may be within the footnotes to the financial statements or a supplemental schedule to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -URI http://asc.fasb.org/topic&trid=2122369 + Details
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