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, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Net sales $ 49,055 $ 47,923 $ 43,914 $ 40,552 $ 44,437 $ 39,018 $ 39,021 $ 38,091 $ 181,444 $ 160,567 $ 164,609
Gross profit 7,225 6,303 6,498 6,894 7,502 6,244 6,572 6,758 26,920 27,076 27,331
Net income (loss) $ 1,739 $ 1,318 $ (1,117) $ 1,598 $ 1,128 $ 1,341 $ 1,273 $ 1,319 $ 3,538 $ 5,062 $ 5,901
Basic net income (loss) per common share (in dollars per share) $ 0.39 $ 0.29 $ (0.25) $ 0.36 $ 0.25 $ 0.30 $ 0.28 $ 0.29 $ 0.78 $ 1.13 $ 1.25
Diluted net income (loss) per common share (in dollars per share) $ 0.39 $ 0.29 $ (0.25) $ 0.36 $ 0.25 $ 0.30 $ 0.28 $ 0.29 $ 0.78 $ 1.13 $ 1.25