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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, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Net sales $ 13,430 $ 13,499 $ 29,278 $ 26,507
Cost of sales 11,402 11,410 24,815 21,653
Gross profit 2,028 2,089 4,463 4,854
Operating expenses:        
Research and development 159 75 226 244
Selling and marketing 570 533 1,233 1,087
General and administrative 1,148 1,026 2,355 2,391
Total operating expenses 1,877 1,634 3,814 3,722
Income (loss) from consolidated continuing operations 151 455 649 1,132
Net equity income from foreign joint ventures’ operations:        
Equity income from foreign joint ventures’ operations 1,110 1,248 1,584 2,706
Foreign joint ventures’ operations related expenses (178) (87) (290) (138)
Net equity income from foreign joint ventures’ operations 932 1,161 1,294 2,568
Income (loss) from consolidated continuing operations and net equity income from foreign joint ventures’ operations 1,083 1,616 1,943 3,700
Other income (expense):        
Interest expense and other, net (21) (28) (33) (44)
Continuing operations income before income taxes 1,062 1,588 1,910 3,656
Provision for income taxes on continuing operations   (380)   (635)
Net income (loss) from continuing operations 1,062 1,208 1,910 3,021
Discontinued operations income (loss) (2,384) (60) (2,652) (135)
Provision for income taxes on discontinued operations            
Net income (loss) from discontinued operations (2,384) (60) (2,652) (135)
Net income (loss) before dividends on redeemable convertible preferred stock (1,322) 1,148 (742) 2,886
Dividends on redeemable convertible preferred stock 86 85 172 170
Net income (loss) attributable to common stockholders $ (1,408) $ 1,063 $ (914) $ 2,716
Earnings (loss) from continuing operations per common share:        
Basic $ 0.12 $ 0.14 $ 0.21 $ 0.36
Diluted $ 0.11 $ 0.12 $ 0.20 $ 0.32
Weighted - average number of continuing operations shares outstanding:        
Basic 8,176,808 8,002,872 8,115,214 7,976,222
Diluted 9,723,076 9,435,695 9,710,422 9,409,537
Loss per common share from discontinued operations:        
Basic and diluted $ (0.29) $ (0.01) $ (0.32) $ (0.02)
Total Earnings (loss) per common share:        
Basic $ (0.17) $ 0.13 $ (0.11) $ 0.34
Diluted $ (0.17) $ 0.12 $ (0.11) $ 0.31
Weighted - average number of common shares outstanding:        
Basic 8,176,808 8,002,872 8,115,214 7,976,222
Diluted 8,176,808 9,435,695 8,115,214 9,409,537