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Condensed Consolidated Statements of Operations (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Income Statement [Abstract]        
Net sales $ 17,585 $ 11,725 $ 47,184 $ 39,029
Cost of sales 14,718 10,036 38,941 33,395
Gross profit 2,867 1,689 8,243 5,634
Operating expenses:        
Research and development 112   356 36
Selling and marketing 626 471 1,997 1,831
General and administrative 1,373 1,095 4,136 3,675
Total operating expenses 2,111 1,566 6,489 5,542
Income (loss) from domestic operations 756 123 1,754 92
Net equity income from foreign joint ventures' operations:        
Equity income from foreign joint ventures' operations 434 746 3,140 2,571
Foreign joint ventures' operations related expenses (66) (23) (204) (246)
Net equity income from foreign joint ventures' operations 368 723 2,936 2,325
Income from domestic operations and net equity income from foreign joint ventures' operations 1,124 846 4,690 2,417
Interest expense and other, net (27) (29) (72) (116)
Income before income taxes 1,097 817 4,618 2,301
Provision for income taxes 110 232 745 566
Net income before dividends on redeemable convertible preferred stock 987 585 3,873 1,735
Dividends on redeemable convertible preferred stock (86) (85) (256) (140)
Net income attributable to common stockholders $ 901 $ 500 $ 3,617 $ 1,595
Earnings per common share:        
Basic $ 0.11 $ 0.06 $ 0.45 $ 0.20
Diluted $ 0.10 $ 0.06 $ 0.41 $ 0.19
Weighted-average number of common shares outstanding:        
Basic 8,004,026 7,915,039 7,985,438 7,895,318
Diluted 9,497,056 8,223,410 9,450,719 8,252,835