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Note 1 - Summary of Significant Accounting Policies - Impacts of Adopting ASU 2014-09 (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Accounts Receivable, Net, Current, Total | $ 151,093 |  |  |  |  | $ 104,153 |  |  |  |  | $ 151,093 | $ 104,153 |
Total assets | 773,524 |  |  |  |  | 649,668 |  |  |  |  | 773,524 | 649,668 |
Accrued expenses | 49,503 |  |  |  |  | 26,520 |  |  |  |  | 49,503 | 26,520 |
Deferred income taxes | 77,467 |  |  |  |  | 63,344 |  |  |  |  | 77,467 | 63,344 |
Total liabilities | 430,382 |  |  |  |  | 354,467 |  |  |  |  | 430,382 | 354,467 |
Retained earnings | 200,566 |  |  |  |  | 157,471 |  |  |  |  | 200,566 | 157,471 |
Total stockholders’ equity | 343,142 |  |  |  |  | 295,201 |  |  |  |  | 343,142 | 295,201 |
Total liabilities and stockholders’ equity | 773,524 |  |  |  |  | 649,668 |  |  |  |  | 773,524 | 649,668 |
Total revenue |  |  |  |  |  |  |  |  |  |  | 885,455 | 705,007 | $ 670,651
Labor and Related Expense |  |  |  |  |  |  |  |  |  |  | 304,447 | 241,784 | 234,526
Revenue equipment rentals and purchased transportation |  |  |  |  |  |  |  |  |  |  | 183,645 | 141,954 | 117,472
Operating Expenses, Total |  |  |  |  |  |  |  |  |  |  | 826,469 | 676,852 | 638,204
Income Tax Expense (Benefit), Total |  |  |  |  |  |  |  |  |  |  | 15,507 | (32,142) | 10,386
Net income | 16,501 | [1] | $ 11,614 | $ 9,971 | $ 4,417 | $ 49,298 | [1] | $ 4,632 | $ 1,548 | $ (39) | 42,503 | 55,439 | 16,835
Comprehensive income |  |  |  |  |  |  |  |  |  |  | 42,414 | 58,372 | 31,739
Deferred income tax expense (benefit) |  |  |  |  |  |  |  |  |  |  | 13,840 | (23,023) | (922)
Receivables and advances |  |  |  |  |  |  |  |  |  |  | (27,199) | (23,670) | 21,207
Accounts payable and accrued expenses |  |  |  |  |  |  |  |  |  |  | 19,232 | (3,425) | (5,116)
Net cash flows provided by operating activities |  |  |  |  |  |  |  |  |  |  | 124,800 | 82,853 | 102,430
Cargo and Freight [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  |  | 779,729 | $ 626,809 | $ 610,845
Calculated under Revenue Guidance in Effect before Topic 606 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts Receivable, Net, Current, Total | 149,849 |  |  |  |  |  |  |  |  |  | 149,849 |  |
Total assets | 772,280 |  |  |  |  |  |  |  |  |  | 772,280 |  |
Accrued expenses | 49,226 |  |  |  |  |  |  |  |  |  | 49,226 |  |
Deferred income taxes | 77,201 |  |  |  |  |  |  |  |  |  | 77,201 |  |
Total liabilities | 429,839 |  |  |  |  |  |  |  |  |  | 429,839 |  |
Retained earnings | 199,865 |  |  |  |  |  |  |  |  |  | 199,865 |  |
Total stockholders’ equity | 342,441 |  |  |  |  |  |  |  |  |  | 342,441 |  |
Total liabilities and stockholders’ equity | 772,280 |  |  |  |  |  |  |  |  |  | 772,280 |  |
Total revenue |  |  |  |  |  |  |  |  |  |  | 885,221 |  |
Labor and Related Expense |  |  |  |  |  |  |  |  |  |  | 304,460 |  |
Revenue equipment rentals and purchased transportation |  |  |  |  |  |  |  |  |  |  | 183,550 |  |
Operating Expenses, Total |  |  |  |  |  |  |  |  |  |  | 826,387 |  |
Income Tax Expense (Benefit), Total |  |  |  |  |  |  |  |  |  |  | 15,466 |  |
Net income |  |  |  |  |  |  |  |  |  |  | 42,392 |  |
Comprehensive income |  |  |  |  |  |  |  |  |  |  | 42,303 |  |
Deferred income tax expense (benefit) |  |  |  |  |  |  |  |  |  |  | 13,799 |  |
Receivables and advances |  |  |  |  |  |  |  |  |  |  | (26,965) |  |
Accounts payable and accrued expenses |  |  |  |  |  |  |  |  |  |  | 19,150 |  |
Net cash flows provided by operating activities |  |  |  |  |  |  |  |  |  |  | 124,800 |  |
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Cargo and Freight [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  |  | 779,495 |  |
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts Receivable, Net, Current, Total | (1,244) |  |  |  |  |  |  |  |  |  | (1,244) |  |
Total assets | (1,244) |  |  |  |  |  |  |  |  |  | (1,244) |  |
Accrued expenses | (277) |  |  |  |  |  |  |  |  |  | (277) |  |
Deferred income taxes | (266) |  |  |  |  |  |  |  |  |  | (266) |  |
Total liabilities | (543) |  |  |  |  |  |  |  |  |  | (543) |  |
Retained earnings | (701) |  |  |  |  |  |  |  |  |  | (701) |  |
Total stockholders’ equity | (701) |  |  |  |  |  |  |  |  |  | (701) |  |
Total liabilities and stockholders’ equity | $ (1,244) |  |  |  |  |  |  |  |  |  | (1,244) |  |
Total revenue |  |  |  |  |  |  |  |  |  |  | (234) |  |
Labor and Related Expense |  |  |  |  |  |  |  |  |  |  | 13 |  |
Revenue equipment rentals and purchased transportation |  |  |  |  |  |  |  |  |  |  | (95) |  |
Operating Expenses, Total |  |  |  |  |  |  |  |  |  |  | (82) |  |
Income Tax Expense (Benefit), Total |  |  |  |  |  |  |  |  |  |  | (41) |  |
Net income |  |  |  |  |  |  |  |  |  |  | (111) |  |
Comprehensive income |  |  |  |  |  |  |  |  |  |  | (111) |  |
Deferred income tax expense (benefit) |  |  |  |  |  |  |  |  |  |  | (41) |  |
Receivables and advances |  |  |  |  |  |  |  |  |  |  | 234 |  |
Accounts payable and accrued expenses |  |  |  |  |  |  |  |  |  |  | (82) |  |
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] |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  |  | $ (234) |  |
[1] | Includes $40.1 million one-time benefit related to the Tax Act.

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