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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash flows from operating activities:      
Net income from consolidated operations $ 9,210 $ 7,970 $ 7,593
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 5,635 5,634 4,846
Loss on sales of property, plant and equipment 7 2 27
Share-based compensation 1,068 1,056 1,069
Deferred income taxes (1,019) 576 437
Excess tax benefits on share-based compensation (145) (356)
Changes in operating assets and liabilities:      
Receivables, net (132) (3,768) (1,011)
Inventories 1,288 51 (1,309)
Prepaid expenses 446 (1,351) (266)
Refundable income taxes (210) 209 2,677
Accounts payable 93 (683) (1,379)
Accrued expenses 1,065 (361) (163)
Other liabilities 246 213 29
Other assets (228) (97) 325
Net cash provided by operating activities 17,469 9,306 12,519
Cash flows from investing activities:      
Additions to property, plant and equipment (10,382) (7,206) (15,742)
Proceeds from sale of property, plant and equipment 7 14 53
Net cash used in investing activities (10,375) (7,192) (15,689)
Cash flows from financing activities:      
Excess tax benefits on share-based compensation 145 356
Proceeds from the exercise of stock options, net of shares presented for exercise 677 529 358
Principal repayment of long-term debt (856) (1,014) (996)
Payment of statutory withholding for stock options exercised and restricted stock units vested (296) (219) (209)
Repurchases of common stock (587)
Net cash used in financing activities (475) (559) (1,078)
Net change in cash and cash equivalents 6,619 1,555 (4,248)
Cash and cash equivalents at beginning of year 31,359 29,804 34,052
Cash and cash equivalents at end of year $ 37,978 $ 31,359 $ 29,804