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Consolidated Statements of Operations - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Sales:    
Net sales $ 33,689 $ 33,151
Costs and expenses:    
Research and development 2,565 3,011
Sales, marketing and support 5,712 6,969
General and administrative 4,650 7,075
Total costs and expenses 34,237 37,399
Loss from operations (548) (4,248)
Interest income 778 208
Interest expense 0 1
Other (expense) income, net (224) 103
Income (loss) from continuing operations before income tax expense 6 (3,938)
Income tax expense from continuing operations 18 329
Net loss from continuing operations (12) (4,267)
Net loss from discontinued operations, net of tax 0 (425)
Net loss $ (12) $ (4,692)
Net loss from continuing operations per common share    
Basic (in shares) $ (0.00) $ (0.23)
Diluted (in shares) (0.00) (0.23)
Net loss from discontinued operations per common share    
Basic (in shares) 0.00 (0.02)
Diluted (in shares) 0.00 (0.02)
Net loss per common share    
Basic (in USD per share) (0.00) (0.25)
Diluted (in USD per share) $ (0.00) $ (0.25)
Weighted average number of common shares outstanding:    
Basic (in shares) 18,882,000 18,449,000
Diluted (in shares) 18,882,000 18,449,000
Product    
Sales:    
Net sales $ 4,949 $ 6,563
Costs and expenses:    
Costs of sales 5,234 5,418
Service    
Sales:    
Net sales 28,740 26,588
Costs and expenses:    
Costs of sales $ 16,076 $ 14,926