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Condensed Consolidated Statements Of Cash Flows (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Operating activities:    
Net income $ 15,402 $ 13,299
Adjustments to reconcile net income to net cash provided (used) by operating activities:    
Depreciation and amortization 8,668 8,250
Deferred income tax 119 2,191
Loss (gain) on sale of property, plant and equipment (59) 7
Allowance for uncollectible accounts (33) 321
Stock-based compensation expense 2,655 1,737
Tax benefit deficiency from the vesting of deferred shares (143) (139)
Other 169 165
Changes in operating assets and liabilities increasing (decreasing) cash:    
Accounts receivable (10,314) (4,281)
Costs and estimated earnings in excess of billings on uncompleted contracts (14,996) 278
Inventories (298) 855
Other assets 481 3,066
Accounts payable 6,500 (16,045)
Billings on uncompleted contracts in excess of costs and estimated earnings (7,223) 8,020
Accrued expenses (453) 2,341
Net cash provided by operating activities 475 20,065
Investing activities:    
Acquisition of property, plant and equipment (9,616) (7,568)
Acquisition related adjustment (Note 4) 241  
Proceeds from asset sales 193 112
Net cash used by investing activities (9,182) (7,456)
Financing activities:    
Issuances of common stock 114 161
Capital lease payments (228) (584)
Tax benefit of exercised stock options   49
Advance under credit agreement 4,764  
Repayments of advances under credit agreement (3,007)  
Payment of debt amendment fees (643) (216)
Treasury shares purchased by Employee Stock Purchase Plan 38  
Open market purchase of treasury shares (8,126)  
Other treasury share purchases (487) (272)
Net cash used by financing activities (7,575) (862)
Effect of exchange rate changes on cash 57 729
Net increase (decrease) in cash and cash equivalents (16,225) 12,476
Cash and cash equivalents, beginning of period 59,357 50,899
Cash and cash equivalents, end of period 43,132 63,375
Supplemental disclosure of cash flow information:    
Income taxes 9,386 3,126
Interest 357 499
Non-cash investing and financing activities:    
Purchases of property, plant and equipment on account $ 648 $ 84