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Quarterly Financial Information (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Quarterly Financial Information (Unaudited)                    
Total net sales $ 84,140 $ 82,702 $ 71,378 $ 73,969 $ 72,625 $ 71,681 $ 66,901 $ 66,866 $ 312,189 $ 278,073
Gross profit 30,963 30,607 23,090 25,648 21,936 25,357 22,318 21,459 110,308 91,070
Net income (loss) from continuing operations $ 7,316 $ 5,809 $ 1,283 $ 1,782 $ (2,287) $ (629) $ 1,185 $ (3,262) $ 16,190 $ (4,993)
Basic and diluted earnings (loss) per share:                    
Earnings (loss) per share from continuing operations (in dollars per share) $ 0.65 $ 0.52 $ 0.11 $ 0.16 $ (0.20) $ (0.06) $ 0.11 $ (0.29) $ 1.44 $ (0.45)