Annual report pursuant to Section 13 and 15(d)

Quarterly Results of Operations (Unaudited) (Details)

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Quarterly Results of Operations (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Quarterly Results of Operations (Unaudited)                      
Net sales $ 99,776 $ 97,653 $ 91,970 $ 92,691 $ 94,123 $ 90,506 $ 84,399 $ 71,730 $ 382,090 $ 340,758 $ 300,390
Gross Profit 6,911 6,880 6,425 6,357 6,957 6,176 6,138 5,538 26,573 24,810 24,355
Net income $ 1,612 $ 1,553 $ 1,362 $ 1,303 $ 1,849 $ 1,369 $ 1,483 $ 1,059 $ 5,830 $ 5,760 $ 6,393
Basic net income per common share (in dollars per share) $ 0.35 $ 0.34 $ 0.29 $ 0.28 $ 0.39 $ 0.29 $ 0.33 $ 0.23 $ 1.26 $ 1.24 $ 1.44
Diluted net income per common share (in dollars per share) $ 0.35 $ 0.33 $ 0.29 $ 0.28 $ 0.39 $ 0.29 $ 0.32 $ 0.23 $ 1.25 $ 1.23 $ 1.41