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Note 1 - Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2019
Notes Tables |
Disaggregation of Revenue [Table Text Block] |
|  | Year ended |
|  | December 31, |
(in thousands) |  | 2019 |  |  | 2018 |  |  | 2017 |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |
Highway Services: |  |  |  |  |  |  |  |  |  |  |  |
Expedited |  | $ | 262,764 |  |  | $ | 317,244 |  |  | $ | 314,579 |
OTR |  |  | 93,757 |  |  |  | 152,064 |  |  |  | 153,413 |
Total Highway Services |  |  | 356,521 |  |  |  | 469,308 |  |  |  | 467,992 |
Dedicated |  |  | 342,473 |  |  |  | 257,739 |  |  |  | 144,845 |
Managed Freight: |  |  |  |  |  |  |  |  |  |  |  |
Brokerage |  |  | 102,479 |  |  |  | 102,730 |  |  |  | 79,630 |
TMS |  |  | 36,136 |  |  |  | 27,036 |  |  |  | 9,412 |
Warehousing |  |  | 47,779 |  |  |  | 23,580 |  |  |  | - |
Total Managed Freight |  |  | 186,394 |  |  |  | 153,346 |  |  |  | 89,042 |
Factoring |  |  | 9,140 |  |  |  | 5,062 |  |  |  | 3,128 |
Total revenues |  | $ | 894,528 |  |  | $ | 885,455 |  |  | $ | 705,007 |
Accounts Receivable, Allowance for Credit Loss [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, |
2019 |  | $ | 1,985 |  |  | $ | 255 |  |  | $ | (296 | ) |  | $ | 1,944 |
2018 |  | $ | 1,456 |  |  | $ | 507 |  |  | $ | 22 |  |  | $ | 1,985 |
2017 |  | $ | 1,345 |  |  | $ | 454 |  |  | $ | (343 | ) |  | $ | 1,456 |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
(in thousands except per share data) |  |  |  |  |  |  |  |  |  |  |  |
|  | 2019 |  |  | 2018 |  |  | 2017 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 8,477 |  |  | $ | 42,503 |  |  | $ | 55,439 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Denominator for basic income per share – weighted-average shares |  |  | 18,435 |  |  |  | 18,340 |  |  |  | 18,279 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |
Equivalent shares issuable upon conversion of unvested restricted shares |  |  | 200 |  |  |  | 129 |  |  |  | 93 |
Denominator for diluted income per share adjusted weighted-average shares and assumed conversions |  |  | 18,635 |  |  |  | 18,469 |  |  |  | 18,372 |
Net income per share: |  |  |  |  |  |  |  |  |  |  |  |
Basic income per share |  | $ | 0.46 |  |  | $ | 2.32 |  |  | $ | 3.03 |
Diluted income per share |  | $ | 0.45 |  |  | $ | 2.30 |  |  | $ | 3.02 |

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