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Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Income Statement [Abstract]
Revenues	$ 338,097	$ 318,511
Cost of revenues	305,632	295,090
Gross profit	32,465	23,421
Selling, general and administrative expenses	23,691	21,201
Operating income	8,774	2,220
Other income (expense):
Interest expense	(389)	(292)
Interest income	474	282
Other	3	546
Income before income tax expense	8,862	2,756
Provision for federal, state and foreign income taxes	2,711	451
Net income	$ 6,151	$ 2,305
Basic earnings per common share (US$ per share)	$ 0.23	$ 0.09
Diluted earnings per common share (US$ per share)	$ 0.22	$ 0.08
Weighted average common shares outstanding:
Basic (shares)	26,935	26,921
Diluted (shares)	27,575	27,589

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