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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Operating activities:    
Net income $ 2,305 $ 3,824
Adjustments to reconcile net income to net cash provided by operating activities, net of effects from acquisitions and disposals:    
Depreciation and amortization 4,543 5,593
Stock-based compensation expense 2,585 2,086
Deferred income tax 362 2,711
Gain on disposal of business (Note 3) (427) 0
Gain on sale of property, plant and equipment (171) (121)
Provision for uncollectible accounts 76 7
Other 101 93
Changes in operating assets and liabilities increasing (decreasing) cash, net of effects from acquisitions and disposals:    
Accounts receivable (11,284) (7,734)
Costs and estimated earnings in excess of billings on uncompleted contracts 302 25,227
Inventories (1,369) (532)
Other assets and liabilities (10,860) (5,291)
Accounts payable 15,261 (14,463)
Billings on uncompleted contracts in excess of costs and estimated earnings (2,229) (9,568)
Accrued expenses 9,624 4,998
Net cash provided by operating activities 8,819 6,830
Investing activities:    
Proceeds from disposal of business (Note 3) 3,693 0
Acquisition of property, plant and equipment (2,482) (1,878)
Proceeds from asset sales 267 248
Net cash provided (used) by investing activities 1,478 (1,630)
Financing activities:    
Advances under senior revolving credit facility 2,298 24,890
Repayments of advances under senior revolving credit facility (765) (27,496)
Payments of debt issuance costs 0 (340)
Issuances of common stock 128 0
Proceeds from issuance of common stock under employee stock purchase plan 78 66
Repurchase of common stock for payment of statutory taxes due on equity-based compensation (1,559) (454)
Net cash provided (used) by financing activities 180 (3,334)
Effect of exchange rate changes on cash and cash equivalents 202 414
Increase in cash and cash equivalents 10,679 2,280
Cash and cash equivalents, beginning of period 64,057 43,805
Cash and cash equivalents, end of period 74,736 46,085
Supplemental disclosure of cash flow information:    
Income taxes 66 98
Interest 456 582
Non-cash investing and financing activities:    
Purchases of property, plant and equipment on account $ 274 $ 191