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Note 16 - Segment Information - Segment Information (Details) - USD ($) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | [1] | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | [2] | Mar. 31, 2015 | [3] | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Revenues |  | $ 190,978,000 | $ 164,500,000 | $ 158,832,000 | $ 156,341,000 | $ 208,061,000 | $ 173,512,000 | $ 175,451,000 | $ 167,216,000 | $ 670,651,000 | $ 724,240,000 | $ 718,980,000
Operating income (loss) |  | 12,267,000 | $ 5,446,000 | $ 7,316,000 | $ 7,418,000 | 24,336,000 | $ 14,629,000 | $ 18,774,000 | $ 10,043,000 | 32,447,000 | 67,782,000 | 39,646,000
Total assets |  | 620,538,000 |  |  |  | 646,717,000 |  |  |  | 620,538,000 | 646,717,000 |
Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 674,828,000 | 726,975,000 | 722,797,000
Operating income (loss) |  |  |  |  |  |  |  |  |  | 32,447,000 | 67,782,000 | 39,646,000
Depreciation and amortization (1) | [4] |  |  |  |  |  |  |  |  | 72,456,000 | 61,384,000 | 46,384,000
Total assets |  | 620,538,000 |  |  |  | 646,717,000 |  |  |  | 620,538,000 | 646,717,000 | 539,304,000
Capital expenditures, net (2) | [5] |  |  |  |  |  |  |  |  | 59,052,000 | 148,994,000 | 89,455,000
Operating Segments [Member] | Truckload [Member] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 601,226,000 | 655,918,000 | 663,001,000
Operating income (loss) |  |  |  |  |  |  |  |  |  | 37,031,000 | 74,107,000 | 54,151,000
Depreciation and amortization (1) | [4] |  |  |  |  |  |  |  |  | 71,173,000 | 60,138,000 | 45,669,000
Total assets |  | 548,882,000 |  |  |  | 580,506,000 |  |  |  | 548,882,000 | 580,506,000 | 463,900,000
Capital expenditures, net (2) | [5] |  |  |  |  |  |  |  |  | 57,242,000 | 147,896,000 | 87,871,000
Operating Segments [Member] | Other Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 73,602,000 | 71,057,000 | 59,796,000
Operating income (loss) |  |  |  |  |  |  |  |  |  | 7,631,000 | 5,768,000 | 3,894,000
Depreciation and amortization (1) | [4] |  |  |  |  |  |  |  |  | 22,000 | 13,000 | 59,000
Total assets |  | 31,289,000 |  |  |  | 26,315,000 |  |  |  | 31,289,000 | 26,315,000 | 27,338,000
Capital expenditures, net (2) | [5] |  |  |  |  |  |  |  |  | 43,000 | 29,000 | 14,000
Operating Segments [Member] | Corporate Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |
Operating income (loss) |  |  |  |  |  |  |  |  |  | (12,215,000) | (12,093,000) | (18,399,000)
Depreciation and amortization (1) | [4] |  |  |  |  |  |  |  |  | 1,261,000 | 1,233,000 | 656,000
Total assets |  | $ 40,367,000 |  |  |  | $ 39,896,000 |  |  |  | 40,367,000 | 39,896,000 | 48,066,000
Capital expenditures, net (2) | [5] |  |  |  |  |  |  |  |  | 1,767,000 | 1,069,000 | 1,570,000
Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | (4,177,000) | (2,735,000) | (3,817,000)
Intersegment Eliminations [Member] | Truckload [Member] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |
Intersegment Eliminations [Member] | Other Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | (4,177,000) | (2,735,000) | (3,817,000)
Intersegment Eliminations [Member] | Corporate Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |
[1] | Adjusted from 10-Q as filed due to implementation of ASU 2016-09.
[2] | Includes $3.6 million in return of previously expensed insurance premiums for the commutation of our primary auto liability policy for the period of April 1, 2013, through September 30, 2014.
[3] | Includes $4.7 million after tax one-time federal income tax credit.
[4] | Includes gains and losses on disposition of equipment .
[5] | Includes equipment purchased under capital leases.

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