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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

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