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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Cash flows from operating activities:    
Net income $ 9,901 $ 6,495
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 5,820 4,171
(Gain) loss on sale of fixed assets (51) 3
Share-based compensation 963 842
Deferred income taxes 1,007 254
Changes in operating assets and liabilities:    
Receivables, net (4,379) (795)
Inventories (2,621) 1,015
Prepaid expenses (262) 47
Refundable income taxes 51 (172)
Other assets (439) (138)
Accounts payable 2,249 429
Accrued expenses (417) 554
Deferred revenue 1,446 104
Non-qualified deferred compensation plan and other liabilities 281 201
Net cash provided by operating activities 13,549 13,010
Cash flows from investing activities:    
Additions to property, plant, and equipment (4,521) (6,880)
Acquisition of Dielectrics, net of cash acquired (76,978)
Proceeds from sale of fixed assets 77 6
Net cash used in investing activities (81,422) (6,874)
Cash flows from financing activities:    
Proceeds from advances on revolving line of credit 36,000
Payments on revolving line of credit (20,000)
Proceeds from the issuance of long-term debt 20,000
Principal repayments of long-term debt (2,143) (772)
Proceeds from exercise of stock options, net of shares presented for exercise 1,270 630
Payment of statutory withholdings for stock options exercised and restricted stock units vested (144) (107)
Net cash provided by (used in) financing activities 34,983 (249)
Net (decrease) increase in cash and cash equivalents (32,890) 5,887
Cash and cash equivalents at beginning of period 37,978 31,359
Cash and cash equivalents at end of period $ 5,088 $ 37,246