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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
	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

X

- 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
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+ References

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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

+ References

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