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Note 12 - Acquisition of Landair Holdings, Inc - Pro Forma Information (Details) - Landair Holdings Inc [Member] - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Total revenue | $ 41,490 |  |  |
Net income | 1,956 |  |  |
Total revenue | 243,303 | $ 208,842 | $ 687,937 | $ 592,333
Net income | $ 11,614 | $ 4,882 | $ 28,886 | $ 6,892
Basic net income per share (in dollars per share) | $ 0.63 | $ 0.27 | $ 1.58 | $ 0.38
Diluted net income per share (in dollars per share) | $ 0.63 | $ 0.27 | $ 1.57 | $ 0.38

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- Definition The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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