Annual report pursuant to Section 13 and 15(d)

Quarterly Financial Data (Unaudited) - Summary of Company's Unaudited Quarterly Results (Detail)

v3.7.0.1
Quarterly Financial Data (Unaudited) - Summary of Company's Unaudited Quarterly Results (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Quarterly Financial Information [Line Items]                      
Net sales $ 25,624 $ 22,654 $ 21,126 $ 22,365 $ 22,301 $ 17,323 $ 22,798 $ 27,617 $ 91,769 $ 90,039 $ 135,169
Gross profit 6,739 6,301 5,010 4,111 4,559 3,524 7,135 8,037 22,161 23,255 41,804
Net income $ 1,801 $ 1,840 $ 1,297 $ 85 $ 520 $ 1,274 $ 1,976 $ 2,361 $ 5,023 $ 6,131 $ 14,735
Per share:                      
Basic income per share $ 0.18 $ 0.19 $ 0.13 $ 0.01 $ 0.05 $ 0.13 $ 0.20 $ 0.23 $ 0.52 $ 0.61 $ 1.46
Diluted income per share 0.18 0.19 0.13 0.01 0.05 0.13 0.20 0.23 0.52 0.61 $ 1.45
Minimum [Member]                      
Per share:                      
Market price range of common stock 21.64 17.19 17.72 17.11 14.39 15.63 15.71 19.82 17.11 14.39  
Maximum [Member]                      
Per share:                      
Market price range of common stock $ 24.99 $ 24.05 $ 21.09 $ 19.92 $ 20.24 $ 18.88 $ 20.60 $ 25.25 $ 24.99 $ 25.25