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Condensed Consolidated Statements of Operations (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Income Statement [Abstract]        
Net sales $ 15,169 $ 12,872 $ 29,599 $ 27,304
Cost of sales 12,773 10,700 24,223 23,359
Gross profit 2,396 2,172 5,376 3,945
Operating expenses:        
Research and development 75 10 244 35
Selling and marketing 706 639 1,371 1,360
General and administrative 1,219 1,355 2,763 2,580
Total operating expenses 2,000 2,004 4,378 3,975
Income (loss) from domestic operations 396 168 998 (30)
Net equity income from foreign joint ventures' operations:        
Equity income from foreign joint ventures' operations 1,248 1,054 2,706 1,825
Foreign joint ventures' operations related expenses (87) (123) (138) (223)
Net equity income from foreign joint ventures' operations 1,161 931 2,568 1,602
Income from domestic operations and net equity income from foreign joint ventures' operations 1,557 1,099 3,566 1,572
Interest expense and other, net (29) (38) (45) (88)
Income before income taxes 1,528 1,061 3,521 1,484
Provision for income taxes 380 245 635 334
Net income before dividends on redeemable convertible preferred stock 1,148 816 2,886 1,150
Dividends on redeemable convertible preferred stock (85) (55) (170) (55)
Net income attributable to common stockholders $ 1,063 $ 761 $ 2,716 $ 1,095
Earnings per common share:        
Basic $ 0.13 $ 0.10 $ 0.34 $ 0.14
Diluted $ 0.12 $ 0.09 $ 0.31 $ 0.13
Weighted-average number of common shares outstanding:        
Basic 8,002,872 7,913,266 7,976,222 7,885,458
Diluted 9,435,695 8,247,031 9,409,537 8,242,975