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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Cash flows from operating activities:    
Net income $ 3,734 $ 1,777
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation and amortization 2,022 1,832
Gain on sale of fixed assets (40)
Share-based compensation 294 237
Deferred income taxes 424 346
Changes in operating assets and liabilities:    
Receivables, net (1,451) (3,520)
Inventories 139 (977)
Prepaid expenses 364 (759)
Refundable income taxes 781 241
Other assets (338) (155)
Accounts payable (907) (290)
Accrued expenses (2,506) (1,445)
Deferred revenue 465 658
Non-qualified deferred compensation plan and other liabilities 608 103
Net cash provided by (used in) operating activities 3,629 (1,992)
Cash flows from investing activities:    
Additions to property, plant, and equipment (1,388) (1,494)
Acquisition of Dielectrics, net of cash acquired (76,978)
Proceeds from sale of fixed assets 40
Net cash used in investing activities (1,388) (78,432)
Cash flows from financing activities:    
Proceeds from advances on revolving line of credit 36,000
Payments on revolving line of credit (3,000) (6,000)
Proceeds from the issuance of long-term debt 20,000
Principal repayments of long-term debt (714)
Proceeds from exercise of stock options, net of shares presented for exercise 285 368
Payment of statutory withholdings for stock options exercised and restricted stock units vested (271) (144)
Net cash (used in) provided by financing activities (2,986) 49,510
Net decrease in cash and cash equivalents (745) (30,914)
Cash and cash equivalents at beginning of period 3,238 37,978
Cash and cash equivalents at end of period $ 2,493 $ 7,064