Annual report pursuant to Section 13 and 15(d)

Quarterly Financial Data (Unaudited) - Summary of the Company's unaudited quarterly results (Detail)

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Quarterly Financial Data (Unaudited) - Summary of the Company's unaudited quarterly results (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Quarterly Financial Information [Line Items]                      
Net sales $ 26,087 $ 23,385 $ 24,490 $ 28,256 $ 30,905 $ 25,633 $ 25,902 $ 22,533 $ 102,218 $ 104,973 $ 103,186
Gross profit 7,418 6,090 8,289 10,015 10,545 7,128 7,913 6,236 31,812 31,822 32,635
Net income $ 2,317 $ 1,431 $ 2,589 $ 3,808 $ 4,096 $ 3,047 $ 2,615 $ 1,390 $ 10,145 $ 11,148 $ 10,553
Per share:                      
Basic income per share $ 0.23 $ 0.14 $ 0.26 $ 0.38 $ 0.41 $ 0.30 $ 0.26 $ 0.14 $ 1.01 $ 1.11 $ 1.06
Diluted income per share $ 0.23 $ 0.14 $ 0.26 $ 0.38 $ 0.41 $ 0.30 $ 0.26 $ 0.14 $ 1.00 $ 1.11 $ 1.06
Minimum [Member]
                     
Per share:                      
Market price range of common stock $ 30.23 $ 32.95 $ 30.26 $ 22.36 $ 19.60 $ 16.45 $ 16.20 $ 17.02 $ 22.36 $ 16.20  
Maximum [Member]
                     
Per share:                      
Market price range of common stock $ 37.23 $ 41.94 $ 38.96 $ 31.41 $ 24.80 $ 21.22 $ 20.00 $ 23.13 $ 41.94 $ 24.80