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Condensed Consolidated Statements of Operations (Unaudited) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Condensed Consolidated Statements of Operations [Abstract]    
Net sales $ 14,430 $ 14,432
Cost of sales 11,450 12,660
Gross profit 2,980 1,772
Operating expenses:    
Research and development 169 25
Selling and marketing 665 721
General and administrative 1,544 1,225
Total operating expenses 2,378 1,971
Income (loss) from domestic operations 602 (199)
Net equity income from foreign joint ventures' operations:    
Equity income from foreign joint ventures' operations 1,458 771
Foreign joint ventures' operations related expenses (51) (100)
Net equity income from foreign joint ventures' operations 1,407 671
Income from domestic operations and net equity income from foreign joint ventures' operations 2,009 472
Interest expense and other, net (16) (49)
Income before income taxes 1,993 423
Provision for income taxes 255 89
Net income before dividends on redeemable convertible preferred stock 1,738 334
Dividends on redeemable convertible preferred stock 85  
Net income attributable to common stockholders $ 1,653 $ 334
Earnings per common share:    
Basic $ 0.21 $ 0.04
Diluted $ 0.18 $ 0.04
Weighted-average number of common shares outstanding:    
Basic 7,949,571 7,857,650
Diluted 9,383,378 8,494,545