Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Operating activities:
Net income	$ 3,824	$ 9,342
Adjustments to reconcile net income to net cash provided (used) by operating activities:
Depreciation and amortization	5,593	4,904
Deferred income tax	2,711	1,044
Gain on sale of property, plant and equipment	(121)	(138)
Provision for uncollectible accounts	7	54
Stock-based compensation expense	2,086	1,652
Other	93	63
Changes in operating assets and liabilities increasing (decreasing) cash:
Accounts receivable	(7,734)	(40,595)
Costs and estimated earnings in excess of billings on uncompleted contracts	25,227	(1,093)
Inventories	(532)	168
Other assets and liabilities	(5,291)	(2,206)
Accounts payable	(14,463)	(13,597)
Billings on uncompleted contracts in excess of costs and estimated earnings	(9,568)	(5,945)
Accrued expenses	4,998	(3,241)
Net cash provided (used) by operating activities	6,830	(49,588)
Investing activities:
Acquisition of property, plant and equipment	(1,878)	(1,826)
Proceeds from asset sales	248	153
Net cash used by investing activities	(1,630)	(1,673)
Financing activities:
Advances under senior revolving credit facility	24,890	27,186
Repayments of advances under senior revolving credit facility	(27,496)	(10,000)
Payments of debt issuance costs	(340)	0
Issuances of common stock	0	46
Proceeds from issuance of common stock under employee stock purchase plan	66	83
Repurchase of common stock for payment of statutory taxes due on equity-based compensation	(454)	(1,878)
Net cash provided (used) by financing activities	(3,334)	15,437
Effect of exchange rate changes on cash and cash equivalents	414	(253)
Increase (decrease) in cash and cash equivalents	2,280	(36,077)
Cash and cash equivalents, beginning of period	43,805
Cash and cash equivalents, end of period	46,085
Supplemental disclosure of cash flow information:
Income taxes	98	2,997
Interest	582	238
Non-cash investing and financing activities:
Purchases of property, plant and equipment on account	$ 191	$ 79