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Note 1 - Significant Accounting Policies - Impacts of Adopting ASU 2014-09 (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Accounts receivable, net of allowances | $ 134,957 |  | $ 134,957 |  | $ 104,153
Total assets | 747,482 |  | 747,482 |  | 649,668
Accrued expenses | 47,797 |  | 47,797 |  | 26,520
Deferred income taxes | 73,347 |  | 73,347 |  | 63,344
Total liabilities | 421,332 |  | 421,332 |  | 354,467
Retained earnings | 184,064 |  | 184,064 |  | 157,471
Total stockholders’ equity | 326,150 |  | 326,150 |  | 295,201
Total liabilities and stockholders’ equity | 747,482 |  | 747,482 |  | $ 649,668
Revenue from Contract with Customer, Including Assessed Tax | 243,303 | $ 178,631 | 613,187 | $ 501,701 |
Labor and Related Expense | 86,249 | 60,732 | 211,621 | 178,639 |
Revenue equipment rentals and purchased transportation | 47,445 | 36,361 | 115,525 | 90,719 |
Operating Expenses, Total | 227,122 | 169,590 | 576,516 | 488,389 |
Income Tax Expense (Benefit), Total | 4,249 | 2,985 | 9,716 | 3,530 |
Net income | 11,614 | 4,632 | 26,002 | 6,141 |
Comprehensive income | 11,558 | 6,987 | 27,196 | 7,339 |
Deferred income tax expense | 2,676 |  | 9,172 | 16,437 |
Receivables and advances | (16,537) |  | (4,717) | (19,975) |
Accounts payable and accrued expenses | 16,087 |  | 17,723 | (400) |
Net cash flows provided by operating activities | 38,981 |  | 101,614 | 62,787 |
Cargo and Freight [Member] |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 214,623 | $ 159,500 | 535,721 | $ 445,212 |
Calculated under Revenue Guidance in Effect before Topic 606 [Member] |  |  |  |  |
Accounts receivable, net of allowances | 133,681 |  | 133,681 |  |
Total assets | 746,206 |  | 746,206 |  |
Accrued expenses | 47,561 |  | 47,561 |  |
Deferred income taxes | 73,061 |  | 73,061 |  |
Total liabilities | 420,810 |  | 420,810 |  |
Retained earnings | 183,310 |  | 183,310 |  |
Total stockholders’ equity | 325,396 |  | 325,396 |  |
Total liabilities and stockholders’ equity | 746,206 |  | 746,206 |  |
Revenue from Contract with Customer, Including Assessed Tax | 243,352 |  | 612,921 |  |
Labor and Related Expense | 86,248 |  | 211,634 |  |
Revenue equipment rentals and purchased transportation | 47,350 |  | 115,471 |  |
Operating Expenses, Total | 227,026 |  | 576,475 |  |
Income Tax Expense (Benefit), Total | 4,289 |  | 9,654 |  |
Net income | 11,719 |  | 25,838 |  |
Comprehensive income | 11,663 |  | 27,032 |  |
Deferred income tax expense | 2,716 |  | 9,110 |  |
Receivables and advances | (16,586) |  | (4,451) |  |
Accounts payable and accrued expenses | 15,991 |  | 17,682 |  |
Net cash flows provided by operating activities | 38,981 |  | 101,612 |  |
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Cargo and Freight [Member] |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 214,672 |  | 535,455 |  |
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] |  |  |  |  |
Accounts receivable, net of allowances | (1,276) |  | (1,276) |  |
Total assets | (1,276) |  | (1,276) |  |
Accrued expenses | (236) |  | (236) |  |
Deferred income taxes | (286) |  | (286) |  |
Total liabilities | (522) |  | (522) |  |
Retained earnings | (754) |  | (754) |  |
Total stockholders’ equity | (754) |  | (754) |  |
Total liabilities and stockholders’ equity | (1,276) |  | (1,276) |  |
Revenue from Contract with Customer, Including Assessed Tax | 49 |  | (266) |  |
Labor and Related Expense | (1) |  | 13 |  |
Revenue equipment rentals and purchased transportation | (95) |  | (54) |  |
Operating Expenses, Total | (96) |  | (41) |  |
Income Tax Expense (Benefit), Total | 40 |  | (62) |  |
Net income | 105 |  | (164) |  |
Comprehensive income | 105 |  | (163) |  |
Deferred income tax expense | 40 |  | (62) |  |
Receivables and advances | (49) |  | 266 |  |
Accounts payable and accrued expenses | (96) |  | (41) |  |
Net cash flows provided by operating activities |  |  |  |  |
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Cargo and Freight [Member] |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | $ 49 |  | $ (266) |  |

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