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Note 16 - Segment Information - Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | [2] | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Revenues |  | $ 203,306 | [1] | $ 178,631 | $ 164,326 | $ 158,744 | $ 190,978 | $ 164,500 | $ 158,832 | $ 156,341 | $ 705,007 | $ 670,651 | $ 724,240
Operating income (loss) |  | 14,843 | [1] | $ 9,041 | $ 3,962 | $ 309 | 12,267 | $ 5,446 | $ 7,316 | $ 7,418 | 28,155 | 32,447 | 67,782
Total assets |  | 649,668 |  |  |  |  | 620,538 |  |  |  | 649,668 | 620,538 |
Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  | 711,016 | 674,828 | 726,975
Operating income (loss) |  |  |  |  |  |  |  |  |  |  | 28,155 | 32,447 | 67,782
Depreciation and amortization (1) | [3] |  |  |  |  |  |  |  |  |  | 76,447 | 72,456 | 61,384
Total assets |  | 649,668 |  |  |  |  | 620,538 |  |  |  | 649,668 | 620,538 | 646,717
Capital expenditures, net (2) | [4] |  |  |  |  |  |  |  |  |  | 72,006 | 59,052 | 148,994
Operating Segments [Member] | Truckload [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  | 612,834 | 601,226 | 655,918
Operating income (loss) |  |  |  |  |  |  |  |  |  |  | 38,781 | 37,031 | 74,107
Depreciation and amortization (1) | [3] |  |  |  |  |  |  |  |  |  | 75,013 | 71,173 | 60,138
Total assets |  | 557,399 |  |  |  |  | 548,882 |  |  |  | 557,399 | 548,882 | 580,506
Capital expenditures, net (2) | [4] |  |  |  |  |  |  |  |  |  | 70,300 | 57,242 | 147,896
Operating Segments [Member] | Other Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  | 98,182 | 73,602 | 71,057
Operating income (loss) |  |  |  |  |  |  |  |  |  |  | 8,588 | 7,631 | 5,768
Depreciation and amortization (1) | [3] |  |  |  |  |  |  |  |  |  | 24 | 22 | 13
Total assets |  | 42,479 |  |  |  |  | 31,289 |  |  |  | 42,479 | 31,289 | 26,315
Capital expenditures, net (2) | [4] |  |  |  |  |  |  |  |  |  | 810 | 43 | 29
Operating Segments [Member] | Corporate Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |
Operating income (loss) |  |  |  |  |  |  |  |  |  |  | (19,214) | (12,215) | (12,093)
Depreciation and amortization (1) | [3] |  |  |  |  |  |  |  |  |  | 1,410 | 1,261 | 1,233
Total assets |  | $ 49,790 |  |  |  |  | $ 40,367 |  |  |  | 49,790 | 40,367 | 39,896
Capital expenditures, net (2) | [4] |  |  |  |  |  |  |  |  |  | 896 | 1,767 | 1,069
Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  | (6,009) | (4,177) | (2,735)
Intersegment Eliminations [Member] | Truckload [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |
Intersegment Eliminations [Member] | Other Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  | (6,009) | (4,177) | (2,735)
Intersegment Eliminations [Member] | Corporate Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Includes $40.1m one-time benefit related to the Tax Cuts and Jobs Act.
[2] | Adjusted from 10-Q as filed due to implementation of ASU 2016-09.
[3] | Includes gains and losses on disposition of equipment.
[4] | Includes equipment purchased under capital leases.

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