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Note 2 - Adoption of New Accounting Standard (Tables) | 12 Months Ended
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Dec. 31, 2018
Notes Tables |
Cumulative Effect of Adjustments for New Accounting Pronouncements on Balance Sheet [Table Text Block] |
(In thousands) |  | Balance at December 31, 2017 |  |  | Adjustments due to ASC 606 |  |  | Balance at January 1, 2018 |
Assets: |  |  |  |  |  |  |  |  |  |  |  |
Prepaid expenses and other |  | $ | 19,810 |  |  | $ | 2,445 | (a) |  | $ | 22,255 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |
Accounts payable and accrued liabilities |  |  | 38,100 |  |  |  | 1,960 |  |  |  | 40,060 |
Stockholders’ equity: |  |  |  |  |  |  |  |  |  |  |  |
Retained earnings |  |  | 448,542 |  |  |  | 485 |  |  |  | 449,027 |
Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block] |
|  | Year Ended December 31, 2018 |
(In thousands) |  | Prior to Adoption of ASC 606 |  |  | Adjustments due to ASC 606 |  |  | As Reported |
Operating revenue |  | $ | 788,216 |  |  | $ | (622 | ) |  | $ | 787,594 |
Operating expenses: |  |  |  |  |  |  |  |  |  |  |  |
Salaries, wages and benefits |  |  | 252,327 |  |  |  | (280 | ) |  |  | 252,047 |
Purchased transportation |  |  | 144,573 |  |  |  | 38 |  |  |  | 144,611 |
Fuel and fuel taxes |  |  | 121,666 |  |  |  | (33 | ) |  |  | 121,633 |
Supplies and maintenance |  |  | 40,832 |  |  |  | 21 |  |  |  | 40,853 |
Income taxes expense |  |  | 16,121 |  |  |  | (119 | ) |  |  | 16,002 |
Net income |  |  | 55,276 |  |  |  | (249 | ) |  |  | 55,027 |
|  | Balance at December 31, 2018 |
(In thousands) |  | Prior to Adoption of ASC 606 |  |  | Adjustments due to ASC 606 |  |  | As Reported |
Assets: |  |  |  |  |  |  |  |  |  |  |  |
Prepaid expenses and other |  | $ | 18,101 |  |  | $ | 1,823 | (a) |  | $ | 19,924 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |
Accounts payable and accrued liabilities |  |  | 42,283 |  |  |  | 1,587 |  |  |  | 43,870 |
Stockholders’ equity: |  |  |  |  |  |  |  |  |  |  |  |
Retained earnings |  |  | 498,359 |  |  |  | 236 |  |  |  | 498,595 |

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