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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash flows from operating activities:      
Net income from consolidated operations $ 14,311 $ 9,210 $ 7,970
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 7,831 5,635 5,634
(Gain) loss on sales of property, plant and equipment (47) 7 2
Share-based compensation 1,212 1,068 1,056
Deferred income taxes 1,881 (1,019) 576
Excess tax benefits on share-based compensation (145)
Changes in operating assets and liabilities:      
Receivables, net (2,556) (132) (3,768)
Inventories (2,295) 1,288 51
Prepaid expenses (249) 446 (1,351)
Refundable income taxes (1,268) (210) 209
Other assets (76) (228) (97)
Accounts payable 1,113 93 (683)
Accrued expenses 1,472 974 (567)
Deferred revenue 35 91 206
Non-qualified deferred compensation plan and other liabilities (44) 246 213
Net cash provided by operating activities 21,320 17,469 9,306
Cash flows from investing activities:      
Additions to property, plant and equipment (5,428) (10,382) (7,206)
Acquisition of Dieletrics, net of cash acquired (76,978)
Proceeds from sale of property, plant and equipment 77 7 14
Net cash used in investing activities (82,329) (10,375) (7,192)
Cash flows from financing activities:      
Proceeds from advances on revolving line of credit 36,000
Payments on revolving line of credit (28,000)
Proceeds from the issuance of long-term debt 20,000
Principal repayment of long-term debt (2,857) (856) (1,014)
Proceeds from the exercise of stock options, net of shares presented for exercise 1,270 677 529
Payment of statutory withholding for stock options exercised and restricted stock units vested (144) (296) (219)
Excess tax benefits on share-based compensation 145
Net cash provided by (used in) financing activities 26,269 (475) (559)
Net change in cash and cash equivalents (34,740) 6,619 1,555
Cash and cash equivalents at beginning of year 37,978 31,359 29,804
Cash and cash equivalents at end of year $ 3,238 $ 37,978 $ 31,359