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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Revenues $ 11,301 $ 8,276 $ 19,329 $ 17,058
Cost of revenues 5,964 4,266 10,288 8,446
Gross Profit 5,337 4,010 9,041 8,612
Operating expenses        
Selling, general and administrative 3,824 2,732 7,155 5,554
Research and development 960 949 2,026 2,033
Total operating expenses 4,784 3,681 9,181 7,587
Income (loss) from operations 553 329 (140) 1,025
Other income (expense), net (8) 70 61 166
Income (loss) before income taxes 545 399 (79) 1,191
Income tax expense 283 97 278 269
Net income (loss) $ 262 $ 302 $ (357) $ 922
Net income (loss) per common share - basic and diluted (in dollars per share) $ 0.01 $ 0.01 $ (0.01) $ 0.03
Weighted average common shares outstanding:        
Basic (in shares) 33,683,240 33,094,596 33,629,479 33,036,786
Diluted (in shares) 34,779,266 33,732,619 33,629,479 33,708,832
Product [Member]        
Revenues $ 10,131 $ 7,553 $ 17,081 $ 15,561
Service [Member]        
Revenues $ 1,170 $ 723 $ 2,248 $ 1,497