Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Operating activities:
Net income	$ 16,641	$ 15,402
Adjustments to reconcile net income to net cash provided (used) by operating activities:
Depreciation and amortization	9,211	8,668
Deferred income tax	208	119
Gain on sale of property, plant and equipment	(9)	(59)
Allowance for uncollectible accounts	662	(33)
Stock-based compensation expense	2,830	2,655
Other	97	26
Changes in operating assets and liabilities increasing (decreasing) cash:
Accounts receivable	(23,222)	(10,314)
Costs and estimated earnings in excess of billings on uncompleted contracts	(1,997)	(14,996)
Inventories	(1,311)	(298)
Other assets	(2,942)	481
Accounts payable	9,037	6,500
Billings on uncompleted contracts in excess of costs and estimated earnings	19,500	(7,223)
Accrued expenses	7,492	(453)
Net cash provided (used) by operating activities	36,197	475
Investing activities:
Acquisition of property, plant and equipment	(16,640)	(9,616)
Acquisition	(8,250)	0
Acquisition Related Adjustment for Final Working Capital Settlement	0	241
Proceeds from asset sales	171	193
Net cash used by investing activities	(24,719)	(9,182)
Financing activities:
Issuances of common stock	558	114
Capital lease payments	(39)	(228)
Excess tax benefit of exercised stock options and vesting of deferred shares	42	0
Payments of debt amendment fees	0	(643)
Advances under credit agreement	25,565	4,764
Repayments of advances under credit agreement	(25,565)	(3,007)
Treasury shares purchased by Employee Stock Purchase Plan	35	38
Open market purchase of treasury shares	0	(8,126)
Other treasury share purchases	(1,082)	(487)
Net cash provided (used) by financing activities	(486)	(7,575)
Effect of exchange rate changes on cash	(43)	57
Net decrease in cash and cash equivalents	10,949	(16,225)
Cash and cash equivalents, beginning of period	39,726	59,357
Cash and cash equivalents, end of period	50,675	43,132
Supplemental disclosure of cash flow information:
Income taxes	7,404	9,386
Interest	457	357
Non-cash investing and financing activities:
Purchases of property, plant and equipment on account	$ 748	$ 648