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Condensed Consolidated Statements of Operations (Unaudited) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Condensed Consolidated Statements of Operations [Abstract]        
Revenue $ 11,725 $ 13,704 $ 39,029 $ 37,200
Cost of sales 10,036 11,521 33,395 32,313
Gross profit 1,689 2,183 5,634 4,887
Operating expenses:        
Research and development 0 161 36 597
Selling and marketing 471 619 1,831 1,844
General and administrative 1,095 1,351 3,675 4,267
Total operating expenses 1,566 2,131 5,542 6,708
Income (loss) from domestic operations 123 52 92 (1,821)
Net equity income from foreign joint ventures' operations:        
Equity income from foreign joint ventures' operations 746 822 2,571 1,320
Foreign joint ventures' operations related expenses (23) (113) (246) (359)
Net equity income from foreign joint ventures' operations 723 709 2,325 961
Income (loss) from domestic operations and net equity income from foreign joint ventures' operations 846 761 2,417 (860)
Interest expense and other, net (29) (79) (116) (182)
Total other income (expense) (29) (79) (116) (182)
Income (loss) before income taxes 817 682 2,301 (1,042)
Provision for (benefit from) income taxes 232 323 566 (352)
Net income (loss) before dividends on mandatorily redeemable convertible preferred stock 585 359 1,735 (690)
Dividends on mandatorily redeemable convertible preferred stock (85)    (140)   
Net income (loss) attributable to common stockholders $ 500 $ 359 $ 1,595 $ (690)
Earnings (loss) per common share:        
Basic $ 0.06 $ 0.05 $ 0.20 $ (0.09)
Diluted $ 0.06 $ 0.04 $ 0.19 $ (0.09)
Weighted-average number of common shares outstanding:        
Basic 7,915,039 7,825,574 7,895,318 7,808,658
Diluted 8,223,410 8,081,843 8,252,835 7,808,658