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Consolidated Statements of Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Income Statement [Abstract]        
Net sales $ 29,553 $ 26,039 $ 88,091 $ 76,441
Cost of goods sold 21,915 17,710 63,273 53,613
Depreciation expense 645 752 2,099 2,326
Total cost of goods sold 22,560 18,462 65,372 55,939
Gross profit 6,993 7,577 22,719 20,502
Selling expenses 2,722 2,116 8,510 7,411
General and administrative 3,194 2,805 8,702 8,681
Amortization expense 33 39 33 117
Total operating expenses 5,949 4,960 17,245 16,209
Income from operations 1,044 2,617 5,474 4,293
Other income (expense):        
Interest expense (30) (27) (72) (96)
Gain on investments 0 0 2 4
Loss on sale of property and equipment (5) 0 (88) (28)
Other (expense) income, net (2) 0 (61) 2
Total other income (expense) (37) (27) (219) (118)
Income before provision for income taxes 1,007 2,590 5,255 4,175
Provision for income taxes 527 764 1,851 1,223
Net income $ 480 $ 1,826 $ 3,404 $ 2,952
Earnings (loss) per common share:        
Basic $ 0.03 $ 0.12 $ 0.22 $ 0.19
Diluted $ 0.03 $ 0.12 $ 0.22 $ 0.19
Weighted average common shares:        
Basic 15,473 15,602 15,572 15,595
Diluted 15,651 15,642 15,712 15,621