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Consolidated Statements of Cash Flows (Unaudited) (USD $)
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Cash flows from operating activities:    
Net income $ 2,635,000 $ 2,269,000
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 1,202,000 984,000
Deferred income taxes (25,000) 0
Mark-to-market of interest rate swaps (20,000) (64,000)
Share-based compensation 89,000 73,000
Gain on translation of foreign currency financial statements (44,000) (151,000)
Change in operating assets and liabilities:    
Accounts receivable (2,996,000) (4,228,000)
Inventories (977,000) (1,124,000)
Prepaid and other assets (3,000) (382,000)
Accounts payable 1,618,000 (142,000)
Accrued and other liabilities (1,448,000) 108,000
Post retirement benefits liability (243,000) (25,000)
Net cash used in operating activities (212,000) (2,682,000)
Cash flows from investing activities:    
Purchase of property, plant and equipment (2,469,000) (344,000)
Net cash used in investing activities (2,469,000) (344,000)
Cash flows from financing activities:    
Gross repayments on revolving line of credit (2,910,000) 0
Gross borrowings on revolving line of credit 3,103,000 0
Payment of principal on Mexican loan (1,600,000) (1,600,000)
Payments of principal on capex loan (428,000) (428,000)
Payment of principal on term loan 0 (107,000)
Payment of principal on industrial development revenue bond (190,000) (175,000)
Payments related to purchase of treasury stock (9,000) 0
Proceeds from issuance of common stock 81,000 57,000
Net cash used in financing activities (1,953,000) (2,253,000)
Net change in cash and cash equivalents (4,634,000) (5,279,000)
Cash and cash equivalents at beginning of period 4,634,000 5,657,000
Cash and cash equivalents at end of period 0 378,000
Cash paid for:    
Interest (net of amounts capitalized) 99,000 205,000
Income taxes 305,000 540,000
Non Cash:    
Fixed asset purchases in accounts payable $ 749,000 $ 77,000