Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Income Statement [Abstract]
Revenue	$ 182,771	$ 338,097
Cost of revenue	168,421	305,632
Gross profit	14,350	32,465
Selling, general and administrative expenses	18,128	23,691
Restructuring costs	(320)	0
Operating income (loss)	(3,458)	8,774
Other income (expense):
Interest expense	(375)	(389)
Interest income	33	474
Other	1,033	3
Income (loss) before income tax expense	(2,767)	8,862
Provision for federal, state and foreign income taxes	270	2,711
Net income (loss)	$ (3,037)	$ 6,151
Basic earnings (loss) per common share (US$ per share)	$ (0.12)	$ 0.23
Diluted earnings (loss) per common share (US$ per share)	$ (0.12)	$ 0.22
Weighted average common shares outstanding:
Basic (shares)	26,265	26,935
Diluted (shares)	26,265	27,575