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Consolidated Statements of Operations (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Net sales $ 65,330 $ 54,065
Cost of sales 53,515 45,942
Gross profit 11,815 8,123
Operating expenses:    
Research and development 499 103
Selling and marketing 2,693 2,455
General and administrative 6,173 5,146
Total operating expenses 9,365 7,704
Income (loss) from domestic operations 2,450 419
Net equity income from foreign joint ventures' operations:    
Equity income from foreign joint ventures' operations 3,024 3,088
Foreign joint ventures' operations related expenses (267) (343)
Net equity income from foreign joint ventures’ operations 2,757 2,745
Income (loss) from domestic operations and net equity income from foreign joint ventures' operations 5,207 3,164
Other income (expense):    
Interest expense (28) (111)
Other, net 85 (37)
Total other income (expense), net 57 (148)
Income (loss) before income taxes 5,264 3,016
Provision for income taxes (713) (707)
Net income (loss) before dividends on redeemable preferred stock 4,551 2,309
Dividends on redeemable preferred stock (342) (225)
Net income (loss) attributable to common stockholders $ 4,209 $ 2,084
Earnings (loss) per common share:    
Basic $ 0.53 $ 0.26
Diluted $ 0.48 $ 0.25
Weighted - average number of common shares outstanding:    
Basic 7,990,690 7,901,225
Diluted 9,472,506 8,258,742