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Computation of Basic and Diluted Net Income (Loss) Per Common Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 29, 2013
Jun. 30, 2012
Jun. 29, 2013
Jun. 30, 2012
Numerator:        
Income from continuing operations $ 415 $ 397 $ 1,289 $ 132
Income (loss) from discontinued operations, net of tax 0 (61) 0 1,809
Net income $ 415 $ 336 $ 1,289 $ 1,941
Denominator:        
Weighted average shares of common stock (basic) 8,824 8,983 8,668 8,958
Effect of dilutive preferred shares 792 1,000 895 1,000
Effect of dilutive stock options 273 262 267 277
Effect of dilutive contingent shares 116 41 73 35
Weighted average shares of common stock (diluted) 10,005 10,286 9,903 10,270
Basic income per share:        
Continuing operations $ 0.05 $ 0.04 $ 0.15 $ 0.01
Discontinued operations $ 0.00 $ 0.00 $ 0.00 $ 0.21
Net income $ 0.05 $ 0.04 $ 0.15 $ 0.22
Diluted income (loss) per share:        
Continuing operations $ 0.04 $ 0.04 $ 0.13 $ 0.01
Discontinued operations $ 0.00 $ (0.01) $ 0.00 $ 0.18
Net income $ 0.04 $ 0.03 $ 0.13 $ 0.19