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Consolidated Statements of Cash Flows (Unaudited) (USD $)
 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Cash flows from operating activities:    
Net income $ 5,111,242 $ 304,361
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 1,967,173 1,966,716
Deferred income taxes (20,654) 1,021,501
Mark-to-market of interest rate swaps 886 267,485
Share-based compensation 192,728 188,762
Loss on disposal of assets   14,277
Gain on translation of foreign currency financial statements (197,000) (50,334)
Change in operating assets and liabilities:    
Accounts receivable (5,636,274) (2,206,827)
Inventories (2,239,185) (1,102,922)
Prepaid and other assets (526,977) (422,744)
Accounts payable 1,089,460 867,609
Accrued and other liabilities 1,005,454 1,021,037
Post retirement benefits liability (99,627) 604,021
Net cash provided by operating activities 647,226 2,472,942
Cash flows from investing activities:    
Purchase of property, plant and equipment (3,386,982) (1,741,488)
Net cash used in investing activities (3,386,982) (1,741,488)
Cash flows from financing activities:    
Payment of principal on Mexican loan (1,600,000)  
Payments of principal on capex loan (857,143) (857,143)
Payment of principal on term loan (107,131) (642,858)
Payment of principal on industrial development revenue bond (355,000) (330,000)
Payments related to purchase of treasury stock (60,772)  
Proceeds from issuance of common stock 62,937 33,920
Net cash used in financing activities (2,917,109) (1,796,081)
Net change in cash and cash equivalents (5,656,865) (1,064,627)
Cash and cash equivalents at beginning of period 5,656,865 4,141,838
Cash and cash equivalents at end of period 0 3,077,211
Cash paid for:    
Interest 364,544 542,510
Income taxes 2,240,000 167,812
Non Cash:    
Fixed asset purchases in accounts payable $ 147,700 $ 65,545