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Consolidated Statements of Cash Flows (Unaudited) (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Cash flows from operating activities:    
Net income $ 1,681,000 $ 2,635,000
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 1,239,000 1,202,000
Deferred income taxes (15,000) (25,000)
Interest rate swaps — mark-to-market and amortization of losses (21,000) (20,000)
Share-based compensation 90,000 89,000
(Gain) loss on foreign currency translation and transaction (34,000) (44,000)
Change in operating assets and liabilities:    
Accounts receivable (2,480,000) (2,996,000)
Inventories 715,000 (977,000)
Prepaid and other assets (189,000) (3,000)
Accounts payable 2,644,000 1,618,000
Accrued and other liabilities (2,220,000) (1,448,000)
Post retirement benefits liability (100,000) (243,000)
Net cash provided by operating activities 1,310,000 (212,000)
Cash flows from investing activities:    
Purchase of property, plant and equipment (2,308,000) (2,469,000)
Net cash used in investing activities (2,308,000) (2,469,000)
Cash flows from financing activities:    
Gross repayments on revolving line of credit 0 (2,910,000)
Gross borrowings on revolving line of credit 0 3,103,000
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 industrial development revenue bond (210,000) (190,000)
Payments related to purchase of treasury stock 0 (9,000)
Proceeds from issuance of common stock 14,000 81,000
Net cash used in financing activities (2,224,000) (1,953,000)
Net change in cash and cash equivalents (3,222,000) (4,634,000)
Cash and cash equivalents at beginning of period 7,838,000 4,634,000
Cash and cash equivalents at end of period 4,616,000 0
Cash paid for:    
Interest (net of amounts capitalized) 82,000 99,000
Income taxes 17,000 305,000
Non Cash:    
Fixed asset purchases in accounts payable $ 145,000 $ 749,000