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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Cash flows from operating activities:    
Net income $ 6,866 $ 8,190
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 4,878 4,523
Deferred income taxes 279 (782)
Mark-to-market of interest rate swaps (73) (64)
Share-based compensation 413 410
Loss on disposal of assets 5 0
Loss on foreign currency translation and transaction 27 4
Change in operating assets and liabilities:    
Accounts receivable (7,446) 7,425
Inventories (862) 1,444
Taxes receivable 944 (1,271)
Prepaid and other assets 93 (558)
Accounts payable 2,259 (2,099)
Accrued and other liabilities 125 (2,593)
Post retirement benefits liability (591) 169
Net cash provided by operating activities 6,917 14,798
Cash flows from investing activities:    
Purchase of property, plant and equipment (9,332) (8,258)
Proceeds from sale of property and equipment 92 777
Net cash used in investing activities (9,240) (7,481)
Cash flows from financing activities:    
Gross borrowings on revolving line of credit 0 (47,369)
Gross borrowings on revolving line of credit 0 47,369
Payment of principal on Mexican loan (1,600) (1,600)
Payment of principal on capex loan (1,714) (1,714)
Payment of principal on industrial development revenue bond (420) (790)
Excess tax benefit from equity incentive plans 409 163
Payments related to the purchase of treasury stock (334) (253)
Proceeds from issuance of common stock 410 81
Net cash used in financing activities (3,249) (4,113)
Net change in cash and cash equivalents (5,572) 3,204
Cash and cash equivalents at beginning of year 7,838  
Cash and cash equivalents at end of year 2,266 7,838
Cash paid for:    
Interest (net of amounts capitalized) 204 284
Income taxes 1,296 4,734
Non Cash:    
Fixed asset purchases in accounts payable $ 709 $ 241