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Consolidated Statements of Operations - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Revenues:    
Product sales $ 10,487 $ 10,677
Cost of revenues 5,944 5,535
Gross profit 4,543 5,142
Operating expenses    
Selling, general and administrative 6,095 5,037
Research and development 1,935 1,714
Total operating expenses 8,030 6,751
Loss from operations (3,487) (1,609)
Other (expense) income, net (20) 13
Loss before income taxes (3,507) (1,596)
Income tax benefit 0 (291)
Net loss $ (3,507) $ (1,305)
Net loss per common share - basic and diluted (in dollars per share) $ (0.10) $ (0.04)
Weighted average common shares outstanding:    
Basic and diluted (in shares) 36,696,145 36,456,187
Product [Member]    
Revenues:    
Product sales $ 9,118 $ 9,570
Service [Member]    
Revenues:    
Product sales $ 1,369 $ 1,107