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Note 12 - Acquisition of Landair Holdings, Inc. (Details Textual) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jul. 03, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Labor and Related Expense |  | $ 86,249 | $ 60,732 | $ 211,621 | $ 178,639
Operating Expenses, Total |  | 227,122 | 169,590 | 576,516 | 488,389
Depreciation, Depletion and Amortization, Nonproduction, Total |  |  |  | 56,370 | 54,489
Income Tax Expense (Benefit), Total |  | $ 4,249 | 2,985 | 9,716 | 3,530
Adjustment for Sale Bonuses and Non-recurring Compensation [Member] |  |  |  |  |
Labor and Related Expense |  |  |  | (2,100) |
Acquisition-related Costs [Member] |  |  |  |  |
Operating Expenses, Total |  |  |  | 3,400 |
Adjustments Related to Changes in Useful Life of Intangible and Fair Value of Property and Equipment [Member] |  |  |  |  |
Depreciation, Depletion and Amortization, Nonproduction, Total |  |  | 600 | 1,100 | 1,700
Adjustments Related to Financing Obtained by the Company and Extinguishment of Debt Held by Acquiree [Member] |  |  |  |  |
Interest Expense, Total |  |  | $ 1,000 | 2,000 | $ 3,000
Adjustments for Tax Effect of Pro Forma Adjustments and Depreciation Expense [Member] |  |  |  |  |
Income Tax Expense (Benefit), Total |  |  |  | $ 100 |
Landair Holdings Inc [Member] |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired | 100.00% |  |  |  |
Payments to Acquire Businesses, Gross | $ 91,200 |  |  |  |
Payments to Acquire Businesses, Gross Payment of Debt | 15,500 |  |  |  |
Payments to Acquire Businesses, IRC Section 338(h)(10) | 8,200 |  |  |  |
Business Combination, Consideration Transferred, Total | 106,700 |  |  |  |
Cash Acquired from Acquisition | $ 754 |  |  |  |

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