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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
CONSOLIDATED STATEMENTS OF OPERATIONS [Abstract]    
Net sales $ 58,139 $ 39,386
Cost of sales 33,727 24,004
Gross profit 24,412 15,382
Operating expenses:    
Engineering, design and product development 8,570 7,475
Selling and marketing 11,326 7,658
General and administrative 12,193 9,626
Operating expenses 32,089 24,759
Operating loss (7,677) (9,377)
Interest and other income (expense):    
Interest expense (208) (157)
Interest income 0 61
Other, net (16) (283)
Gain from employee retention credit 0 1,500
Gain on forgiveness of long-term debt 0 2,173
Interest and other income (expense) (224) 3,294
Loss before income taxes (7,901) (6,083)
Income tax benefit 1,965 2,042
Net loss $ (5,936) $ (4,041)
Net loss per common share:    
Basic (in dollars per share) $ (0.6) $ (0.43)
Diluted (in dollars per share) $ (0.6) $ (0.43)
Shares used in per-share calculation:    
Basic (in shares) 9,905 9,298
Diluted (in shares) 9,905 9,298