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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
CONSOLIDATED STATEMENTS OF OPERATIONS [Abstract]    
Net sales $ 39,386 $ 30,595
Cost of sales 24,137 17,666
Gross profit 15,249 12,929
Operating expenses:    
Engineering, design and product development 7,475 5,703
Selling and marketing 7,658 6,144
General and administrative 9,626 9,255
Operating expenses 24,759 21,102
Operating income (9,510) (8,173)
Interest and other income (expense):    
Interest expense (157) (130)
Interest income 61 78
Other, net (283) 56
Gain from employee retention credit 1,500 0
Gain on forgiveness of long-term debt 2,173 0
Interest and other income (expense) 3,294 4
Income before income taxes (6,216) (8,169)
Income tax benefit (2,071) (2,539)
Net loss $ (4,145) $ (5,630)
Net loss per common share:    
Basic (in dollars per share) $ (0.45) $ (0.72)
Diluted (in dollars per share) $ (0.45) $ (0.72)
Shares used in per-share calculation:    
Basic (in shares) 9,298 7,827
Diluted (in shares) 9,298 7,827