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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Cash flows from operating activities:    
Net income $ 3,926 $ 3,922
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 2,341 2,247
Gain on sale of fixed assets (31) (12)
Share-based compensation 647 730
Excess tax benefit on share-based compensation (219) (834)
Deferred income taxes 194 (225)
Changes in operating assets and liabilities:    
Receivables, net (3,048) (590)
Inventories 61 (2,381)
Prepaid expenses (1,000) (991)
Refundable income taxes 2,932 746
Other assets (44) (103)
Accounts payable (925) 1,080
Accrued expenses 924 (1,431)
Retirement and other liabilities (71) (216)
Net cash provided by operating activities 5,687 1,942
Cash flows from investing activities:    
Additions to property, plant, and equipment (10,461) (4,309)
Escrow deposit for Texas building purchase   (2,968)
Proceeds from sale of fixed assets 31 22
Net cash used in investing activities (10,430) (7,255)
Cash flows from financing activities:    
Principal repayments of long-term debt (496) (486)
Proceeds from the exercise of stock options, net of attestation 220 323
Excess tax benefit on share-based compensation 219 834
Payment of statutory withholdings for stock options exercised and restricted stock units vested (79) (701)
Net cash used in financing activities (136) (30)
Net decrease in cash and cash equivalents (4,879) (5,343)
Cash and cash equivalents at beginning of period 34,052 37,303
Cash and cash equivalents at end of period $ 29,173 $ 31,960