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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Revenues $ 12,627 $ 11,971 $ 31,956 $ 29,029
Cost of revenues 5,941 5,500 16,229 13,946
Gross Profit 6,686 6,471 15,727 15,083
Operating expenses        
Selling, general and administrative 4,776 3,330 11,931 8,884
Research and development 1,390 1,200 3,416 3,233
Total operating expenses 6,166 4,530 15,347 12,117
Income from operations 520 1,941 380 2,966
Other income (expense), net (2) 36 59 202
Income before income taxes 518 1,977 439 3,168
Income tax expense 228 473 506 742
Net income (loss) $ 290 $ 1,504 $ (67) $ 2,426
Net income (loss) per common share:        
Basic (in dollars per share) $ 0.01 $ 0.05 $ (0.00) $ 0.07
Diluted (in dollars per share) $ 0.01 $ 0.04 $ (0.00) $ 0.07
Weighted average common shares outstanding:        
Basic (in shares) 34,109,167 33,289,426 33,797,774 33,122,042
Diluted (in shares) 35,270,945 34,280,915 33,797,774 33,878,243
Product [Member]        
Revenues $ 10,719 $ 10,933 $ 27,800 $ 26,494
Service [Member]        
Revenues $ 1,908 $ 1,038 $ 4,156 $ 2,535