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Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Income Statement [Abstract]
Revenues	$ 340,568	$ 282,911	$ 659,079	$ 552,821
Cost of revenues	312,682	256,208	607,772	497,227
Gross profit	27,886	26,703	51,307	55,594
Selling, general and administrative expenses	22,359	21,529	43,560	43,099
Operating income	5,527	5,174	7,747	12,495
Other income (expense):
Interest expense	(361)	(819)	(653)	(1,437)
Interest income	274	65	556	104
Other	(22)	(135)	524	14
Income before income tax expense	5,418	4,285	8,174	11,176
Provision (benefit) for federal, state and foreign income taxes	1,486	(247)	1,937	2,820
Net income	$ 3,932	$ 4,532	$ 6,237	$ 8,356
Basic earnings per common share (US$ per share)	$ 0.15	$ 0.17	$ 0.23	$ 0.31
Diluted earnings per common share (US$ per share)	$ 0.14	$ 0.17	$ 0.23	$ 0.31
Weighted average common shares outstanding:
Basic (shares)	27,043	26,771	26,982	26,713
Diluted (shares)	27,582	27,078	27,628	26,933

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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration