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Consolidated Statements of Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Income Statement [Abstract]        
Net sales $ 29,162 $ 25,014 $ 58,538 $ 50,402
Cost of goods sold 20,846 17,279 41,358 35,903
Depreciation expense 639 807 1,454 1,574
Total cost of goods sold 21,485 18,086 42,812 37,477
Gross profit 7,677 6,928 15,726 12,925
Selling expenses 2,566 2,720 5,788 5,295
General and administrative 2,617 2,731 5,508 5,876
Amortization expense 0 39 0 78
Total operating expenses 5,183 5,490 11,296 11,249
Income from operations 2,494 1,438 4,430 1,676
Other income (expense):        
Interest expense (20) (30) (42) (69)
Gain on investments 0 4 2 4
Loss on sale of property and equipment (76) (33) (83) (28)
Other (expense) income, net (49) 5 (59) 2
Total other income (expense) (145) (54) (182) (91)
Income before provision for income taxes 2,349 1,384 4,248 1,585
Provision for income taxes 731 404 1,324 459
Net income $ 1,618 $ 980 $ 2,924 $ 1,126
Earnings (loss) per common share:        
Basic $ 0.10 $ 0.06 $ 0.19 $ 0.07
Diluted $ 0.10 $ 0.06 $ 0.19 $ 0.07
Weighted average common shares:        
Basic 15,639 15,560 15,622 15,591
Diluted 15,793 15,586 15,772 15,607