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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Cash flows from operating activities:    
Net income $ 1,777 $ 2,171
Adjustments to reconcile net income to net cash (used in) provided by operating activities:    
Depreciation and amortization 1,832 1,395
Gain on sale of fixed assets (40) (5)
Share-based compensation 237 209
Deferred income taxes 346 78
Changes in operating assets and liabilities:    
Receivables, net (3,520) (674)
Inventories (977) (260)
Prepaid expenses (759) (588)
Refundable income taxes 241 807
Other assets (155) (14)
Accounts payable (290) 1,513
Accrued expenses (1,445) (682)
Deferred revenue 658 68
Non-qualified deferred compensation plan and other liabilities 103 120
Net cash (used in) provided by operating activities (1,992) 4,138
Cash flows from investing activities:    
Additions to property, plant, and equipment (1,494) (1,463)
Acquisition of Dielectrics, net of cash acquired (76,978)
Proceeds from sale of fixed assets 40 5
Net cash used in investing activities (78,432) (1,458)
Cash flows from financing activities:    
Proceeds from advances on revolving line of credit 36,000
Payments on revolving line of credit (6,000)
Proceeds from the issuance of long-term debt 20,000
Principal repayments of long-term debt (714) (256)
Proceeds from exercise of stock options, net of shares presented for exercise 368 79
Payment of statutory withholdings for stock options exercised and restricted stock units vested (144) (107)
Net cash provided by (used in) financing activities 49,510 (284)
Net (decrease) increase in cash and cash equivalents (30,914) 2,396
Cash and cash equivalents at beginning of period 37,978 31,359
Cash and cash equivalents at end of period $ 7,064 $ 33,755