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Condensed Consolidated Statements of Operations (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Net sales $ 17,400 $ 14,430
Cost of sales 14,828 11,450
Gross profit 2,572 2,980
Operating expenses:    
Research and development 66 169
Selling and marketing 819 665
General and administrative 1,457 1,544
Total operating expenses 2,342 2,378
Income (loss) from domestic operations 230 602
Net equity income from foreign joint ventures’ operations:    
Equity income from foreign joint ventures’ operations 474 1,458
Foreign joint ventures’ operations related expenses (112) (51)
Net equity income from foreign joint ventures’ operations: 362 1,407
Income (loss) from domestic operations and net equity income from foreign joint ventures’ operations 592 2,009
Other income (expense):    
Interest expense and other, net (12) (16)
Income before income taxes 580 1,993
Provision for income taxes   255
Net income (loss) before dividends on redeemable convertible preferred stock 580 1,738
Dividends on redeemable convertible preferred stock 86 85
Net income (loss) attributable to common stockholders $ 494 $ 1,653
Earnings (loss) per common share:    
Basic $ 0.06 $ 0.21
Diluted $ 0.06 $ 0.18
Weighted - average number of common shares outstanding:    
Basic 8,053,497 7,949,571
Diluted 8,625,258 9,383,378