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Note 15 - Acquisition of Landair Holdings, Inc. (Details Textual) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Jul. 03, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Labor and Related Expense |  | $ 304,447 | $ 241,784 | $ 234,526
Operating Expenses, Total |  | 826,469 | 676,852 | 638,204
Depreciation, Depletion and Amortization, Nonproduction, Total |  | 75,859 | 72,422 | 71,647
Income Tax Expense (Benefit), Total |  | 15,507 | (32,142) | $ 10,386
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 |  | 1,100 | 2,200 |
Adjustments Related to Financing Obtained by the Company and Extinguishment of Debt Held by Acquiree [Member] |  |  |  |
Interest Expense, Total |  | 2,000 | $ 4,000 |
Adjustments for Tax Effect of Pro Forma Adjustments and Depreciation Expense [Member] |  |  |  |
Income Tax Expense (Benefit), Total |  | 1,700 |  |
Landair Holdings Inc [Member] |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired | 100.00% |  |  |
Business Combination, Consideration Transferred, Total | $ 106,700 | 106,700 |  |
Business Combination, Consideration Transferred, Cash to Acquiree's Former Owners | 83,000 |  |  |
Business Combination, Consideration Transferred, Reimbursement to Acquiree's Former Owners | 3,200 |  |  |
Business Combination, Consideration Transferred, State Taxes Paid | 5,000 |  |  |
Payments to Acquire Businesses, Gross Payment of Debt | 15,500 |  |  |
Cash Acquired from Acquisition | $ 800 | $ 754 |  |

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