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Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2010
Operating activities: |  |  |
Net income | $ 17,188 | $ 18,982 | $ 4,876
Adjustments to reconcile net income to net cash provided by operating activities, net of effects of acquisitions : |  |  |
Depreciation and amortization | 11,485 | 11,067 | 11,751
(Gain) loss on sale of property, plant and equipment | (158) | 113 | 209
Allowance for uncollectible accounts | 24 | 447 | 2,892
Stock-based compensation expense | 3,504 | 2,395 | 2,052
Adjustment of acquisition payable | (400) |  |
Other | 217 | 231 | 484
Deferred income taxes | 83 | 3,743 | (3,556)
Tax benefit deficiency from the vesting of deferred shares | (152) | (159) | (578)
Changes in operating assets and liabilities increasing (decreasing) cash, net of effects from acquisitions: |  |  |
Accounts receivable | (4,575) | (16,499) | 12,003
Costs and estimated earnings in excess of billings on uncompleted contracts | (28,506) | 890 | (5,724)
Inventories | (233) | 1,202 | 1,238
Other assets | (1,888) | 2,028 | 615
Accounts payable | 12,862 | (9,326) | 1,693
Billings on uncompleted contracts in excess of costs and estimated earnings | (5,192) | 6,608 | (22,816)
Accrued expenses | (1,318) | 1,027 | (740)
Net cash provided by operating activities | 2,941 | 22,749 | 4,399
Investing activities: |  |  |
Acquisition of property, plant and equipment | (13,534) | (10,416) | (5,302)
Proceeds from asset sales | 598 | 150 | 218
Acquisitions, net of cash acquired | 241 | (3,800) |
Net cash used by investing activities | (12,695) | (14,066) | (5,084)
Financing activities: |  |  |
Exercise of stock options | 167 | 166 | 115
Capital lease payments | (258) | (731) | (1,077)
Excess tax benefit of exercised stock options and vesting of deferred shares |  | 50 | 82
Advances under credit agreement | 9,105 |  |
Repayments of advances under credit agreement | (9,105) |  |
Payment of debt amendment fees | (643) | (216) |
Treasury shares sold to Employee Stock Purchase Plan | 47 | 10 |
Open market purchase of treasury shares | (8,126) |  |
Other treasury share purchases | (537) | (299) | (473)
Net cash used by financing activities | (9,350) | (1,020) | (1,353)
Effect of exchange rate changes on cash | (527) | 795 | 461
Net increase (decrease) in cash and cash equivalents | (19,631) | 8,458 | (1,577)
Cash and cash equivalents, beginning of period | 59,357 | 50,899 | 52,476
Cash and cash equivalents, end of period | 39,726 | 59,357 | 50,899
Other cash flow information: |  |  |
Income taxes | 12,016 | 6,251 | 8,641
Interest | 478 | 632 | 530
Non-cash investing: |  |  |
Purchases of property, plant and equipment on account | $ 457 | $ 765 | $ 41

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