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Acquisition (Details 1) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Information of Company's results of operations    
Net sales $ 39,717 $ 40,151
Net income $ 2,130 $ 2,457
Earnings per share:    
Basic $ 0.12 $ 0.16
Diluted $ 0.12 $ 0.14