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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Operating activities:    
Net income $ 6,151 $ 2,305
Adjustments to reconcile net income to net cash provided by operating activities, net of effects from acquisitions and disposals:    
Depreciation and amortization 4,779 4,543
Stock-based compensation expense 3,024 2,585
Deferred income tax 1,990 362
Gain on disposal of business 0 (427)
Gain on sale of property, plant and equipment (93) (171)
Provision for uncollectible accounts 224 76
Other 84 101
Changes in operating assets and liabilities increasing (decreasing) cash, net of effects from acquisitions and disposals:    
Accounts receivable 3,594 (11,284)
Costs and estimated earnings in excess of billings on uncompleted contracts 30,087 302
Inventories 456 (1,369)
Other assets and liabilities (297) (10,860)
Accounts payable (15,240) 15,261
Billings on uncompleted contracts in excess of costs and estimated earnings 24,565 (2,229)
Accrued expenses (3,220) 9,624
Net cash provided by operating activities 56,104 8,819
Investing activities:    
Capital expenditures (8,684) (2,482)
Proceeds from disposal of business 0 3,693
Proceeds from asset sales 151 267
Net cash provided (used) by investing activities (8,533) 1,478
Financing activities:    
Advances under senior secured revolving credit facility 8,984 2,298
Repayments of advances under senior secured revolving credit facility (2,872) (765)
Issuances of common stock 0 128
Proceeds from issuance of common stock under employee stock purchase plan 83 78
Repurchase of common stock for payment of statutory taxes due on equity-based compensation (3,394) (1,559)
Net cash provided by financing activities 2,801 180
Effect of exchange rate changes on cash and cash equivalents (198) 202
Increase in cash and cash equivalents 50,174 10,679
Cash and cash equivalents, beginning of period 89,715 64,057
Cash and cash equivalents, end of period 139,889 74,736
Supplemental disclosure of cash flow information:    
Income taxes 5,069 66
Interest 417 456
Non-cash investing and financing activities:    
Purchases of property, plant and equipment on account $ 263 $ 274