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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Net income $ 6,495 $ 6,479
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 4,171 4,109
Loss (Gain) on sale of fixed assets 3 (4)
Share-based compensation 842 871
Excess tax benefit on share-based compensation (126)
Deferred income taxes 254 224
Changes in operating assets and liabilities:    
Receivables, net (795) (4,826)
Inventories 1,015 (366)
Prepaid expenses 47 (1,231)
Refundable income taxes (172) 1,146
Other assets (138) (93)
Accounts payable 429 197
Accrued expenses 658 (317)
Non-qualified deferred compensation plan and other liabilities 201 205
Net cash provided by operating activities 13,010 6,268
Cash flows from investing activities:    
Additions to property, plant and equipment (6,880) (5,766)
Proceeds from sale of fixed assets 6 4
Net cash used in investing activities (6,874) (5,762)
Cash flows from financing activities:    
Principal repayments of long-term debt (772) (758)
Proceeds from exercise of stock options, net of attestation 630 529
Excess tax benefit on share-based compensation 126
Payment of statutory withholdings for stock options exercised and restricted stock units vested (107) (89)
Net cash used in financing activities (249) (192)
Net increase in cash and cash equivalents 5,887 314
Cash and cash equivalents at beginning of period 31,359 29,804
Cash and cash equivalents at end of period $ 37,246 $ 30,118