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Condensed Consolidated Statements of Operations (Unaudited) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Condensed Consolidated Statements of Operations [Abstract]        
Revenue $ 12,872 $ 11,427 $ 27,304 $ 23,495
Cost of sales 10,700 9,921 23,359 20,792
Gross profit 2,172 1,506 3,945 2,703
Operating expenses:        
Research and development 10 313 35 436
Selling and marketing 639 614 1,360 1,225
General and administrative 1,355 1,859 2,580 2,916
Total operating expenses 2,004 2,786 3,975 4,577
Income (loss) from domestic operations 168 (1,280) (30) (1,874)
Net equity income from foreign joint ventures' operations:        
Equity income from foreign joint ventures' operations 1,054 261 1,825 498
Foreign joint ventures' operations related expenses (123) (117) (223) (246)
Net equity income from foreign joint ventures' operations 931 144 1,602 252
Income (loss) from domestic operations and net equity income from foreign joint ventures' operations 1,099 (1,136) 1,572 (1,622)
Interest expense and other, net (38) (55) (88) (102)
Total other income (expense) (38) (55) (88) (102)
Income (loss) before income taxes 1,061 (1,191) 1,484 (1,724)
Provision for (benefit from) income taxes 245 (464) 334 (675)
Net income (loss) before mandatorily convertible preferred stock 816 (727) 1,150 (1,049)
Dividends on mandatorily redeemable preferred stock (55)    (55)   
Net income attributable to common stockholders $ 761 $ (727) $ 1,095 $ (1,049)
Earnings (loss) per common share:        
Earnings (loss) per common share: Basic $ 0.10 $ (0.09) $ 0.14 $ (0.13)
Diluted $ 0.09 $ (0.09) $ 0.13 $ (0.13)
Weighted-average number of common shares outstanding:        
Basic 7,913,266 7,821,646 7,885,458 7,800,060
Diluted 8,247,031 7,821,646 8,242,975 7,800,060