Annual report pursuant to Section 13 and 15(d)

Quarterly Financial Data (Unaudited) (Details)

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Quarterly Financial Data (Unaudited) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Summary of the Company's unaudited quarterly results                      
Net sales $ 30,905 $ 25,633 $ 25,902 $ 22,533 $ 20,250 $ 24,329 $ 33,595 $ 25,012 $ 104,973 $ 103,186 $ 74,235
Gross profit 10,545 7,128 7,913 6,236 5,176 6,462 12,800 8,197 31,822 32,635 21,851
Net income $ 4,096 $ 3,047 $ 2,615 $ 1,390 $ 429 $ 1,640 $ 5,468 $ 3,016 $ 11,148 $ 10,553 $ 5,874
Per share:                      
Basic income per share $ 0.41 $ 0.30 $ 0.26 $ 0.14 $ 0.04 $ 0.16 $ 0.55 $ 0.30 $ 1.11 $ 1.06 $ 0.59
Diluted income per share $ 0.41 $ 0.30 $ 0.26 $ 0.14 $ 0.04 $ 0.16 $ 0.55 $ 0.30 $ 1.11 $ 1.06 $ 0.59
Maximum [Member]
                     
Per share:                      
Market price range of common stock $ 24.80 $ 21.22 $ 20.00 $ 23.13 $ 25.04 $ 24.98 $ 21.24 $ 26.30 $ 24.80 $ 26.30  
Minimum [Member]
                     
Per share:                      
Market price range of common stock $ 19.60 $ 16.45 $ 16.20 $ 17.02 $ 19.26 $ 14.36 $ 15.00 $ 17.74 $ 16.20 $ 14.36