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Note 4 - Segment Information - Operating Revenue by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
UNITED STATES
Operating revenues	$ 241,843	$ 184,123	$ 474,552	$ 337,309
CANADA
Operating revenues	21,193	26,859	43,138	56,065
MEXICO
Operating revenues	12,363	11,389	23,830	22,413
Operating revenues	$ 275,399	$ 222,371	$ 541,520	$ 415,787

X

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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