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Note 1 - Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2018
Notes Tables |
Disaggregation of Revenue [Table Text Block] |
(in thousands) |  | Twelve Months Ended |
|  | December 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
Total Revenues: |  |  |  |  |  |  |  |  |  |  |  |
Truckload Segment: |  |  |  |  |  |  |  |  |  |  |  |
Expedited |  | $ | 334,118 |  |  | $ | 332,930 |  |  | $ | 370,689 |
Dedicated |  |  | 247,877 |  |  |  | 144,845 |  |  |  | 60,154 |
Refrigerated |  |  | 135,189 |  |  |  | 135,059 |  |  |  | 170,383 |
OTR |  |  | 9,862 |  |  |  | - |  |  |  | - |
Truckload Revenues |  |  | 727,046 |  |  |  | 612,834 |  |  |  | 601,226 |
Managed Freight Segment: |  |  |  |  |  |  |  |  |  |  |  |
Brokerage |  |  | 114,827 |  |  |  | 89,042 |  |  |  | 66,867 |
Warehouse |  |  | 16,480 |  |  |  | - |  |  |  | - |
TMS |  |  | 14,940 |  |  |  | - |  |  |  | - |
Shuttle & Switching |  |  | 7,100 |  |  |  | - |  |  |  | - |
Factoring |  |  | 5,062 |  |  |  | 3,131 |  |  |  | 2,558 |
Managed Freight Revenues |  |  | 158,409 |  |  |  | 92,173 |  |  |  | 69,425 |
Total |  | $ | 885,455 |  |  | $ | 705,007 |  |  | $ | 670,651 |
Summary of Valuation Allowance [Table Text Block] |
Years ended December 31: |  | Beginning balance January 1, |  |  | Additional provisions to (reversal of) allowance |  |  | Write-offs and other adjustments |  |  | Ending balance December 31, |
2018 |  | $ | 1,456 |  |  | $ | 507 |  |  | $ | 22 |  |  | $ | 1,985 |
2017 |  | $ | 1,345 |  |  | $ | 454 |  |  | $ | (343 | ) |  | $ | 1,456 |
2016 |  | $ | 1,857 |  |  | $ | (241 | ) |  | $ | (271 | ) |  | $ | 1,345 |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
(in thousands except per share data) |  |  |  |  |  |  |  |  |  |  |  |
|  | 2018 |  |  | 2017 |  |  | 2016 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 42,503 |  |  | $ | 55,439 |  |  | $ | 16,835 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Denominator for basic income per share – weighted-average shares |  |  | 18,340 |  |  |  | 18,279 |  |  |  | 18,182 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |
Equivalent shares issuable upon conversion of unvested restricted shares |  |  | 129 |  |  |  | 93 |  |  |  | 84 |
Denominator for diluted income per share adjusted weighted-average shares and assumed conversions |  |  | 18,469 |  |  |  | 18,372 |  |  |  | 18,266 |
Net income per share: |  |  |  |  |  |  |  |  |  |  |  |
Basic income per share |  | $ | 2.32 |  |  | $ | 3.03 |  |  | $ | 0.93 |
Diluted income per share |  | $ | 2.30 |  |  | $ | 3.02 |  |  | $ | 0.92 |
Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block] |
|  | Twelve Months Ended December 31, 2018 |
|  |  |  |  |  |  |  |  |  | Balances without
|  |  |  |  |  |  |  |  |  | adoption of Topic
Financial Statement Line Item (in thousands) |  | As reported |  |  | Adjustments |  |  |  | 606 |
Consolidated Balance Sheet |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable, net of allowances |  | $ | 151,093 |  |  | $ | (1,244 | ) |  | $ | 149,849 |
Total assets |  |  | 773,524 |  |  |  | (1,244 | ) |  |  | 772,280 |
Accrued expenses |  |  | 49,503 |  |  |  | (277 | ) |  |  | 49,226 |
Deferred income taxes |  |  | 77,467 |  |  |  | (266 | ) |  |  | 77,201 |
Total liabilities |  |  | 430,382 |  |  |  | (543 | ) |  |  | 429,839 |
Retained earnings |  |  | 200,566 |  |  |  | (701 | ) |  |  | 199,865 |
Total stockholders’ equity |  |  | 343,142 |  |  |  | (701 | ) |  |  | 342,441 |
Total liabilities and stockholders’ equity |  |  | 773,524 |  |  |  | (1,244 | ) |  |  | 772,280 |
Consolidated Statement of Operations |  |  |  |  |  |  |  |  |  |  |  |
Freight revenue |  |  | 779,729 |  |  |  | (234 | ) |  |  | 779,495 |
Total revenue |  |  | 885,455 |  |  |  | (234 | ) |  |  | 885,221 |
Salaries, wages and related expenses |  |  | 304,447 |  |  |  | 13 |  |  |  | 304,460 |
Revenue equipment rentals and purchased transportation |  |  | 183,645 |  |  |  | (95 | ) |  |  | 183,550 |
Total operating expenses |  |  | 826,469 |  |  |  | (82 | ) |  |  | 826,387 |
Income tax expense (benefit) |  |  | 15,507 |  |  |  | (41 | ) |  |  | 15,466 |
Net income |  |  | 42,503 |  |  |  | (111 | ) |  |  | 42,392 |
Consolidated Statement of Comprehensive Income |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  | 42,503 |  |  |  | (111 | ) |  |  | 42,392 |
Comprehensive income |  |  | 42,414 |  |  |  | (111 | ) |  |  | 42,303 |
Consolidated Statement of Cash Flows |  |  |  |  |  |  |  |  |  |  |  |
Operating Cash Flows |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  | 42,503 |  |  |  | (111 | ) |  |  | 42,392 |
Deferred income tax expense (benefit) |  |  | 13,840 |  |  |  | (41 | ) |  |  | 13,799 |
Change in: Receivables and advances |  |  | (27,199 | ) |  |  | 234 |  |  |  | (26,965 | )
Change in: Accounts payable and accrued expenses |  |  | 19,232 |  |  |  | (82 | ) |  |  | 19,150 |
Net cash flows provided by operating activities |  |  | 124,800 |  |  |  | - |  |  |  | 124,800 |

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