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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
 3 Months Ended 6 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Revenues:        
Revenues $ 8,276,773 $ 10,191,691 $ 17,058,475 $ 20,369,250
Cost of revenues 4,266,881 5,001,183 8,446,478 10,089,484
Gross Profit 4,009,892 5,190,508 8,611,997 10,279,766
Operating expenses        
Selling, general and administrative 2,732,340 2,475,378 5,553,865 5,226,386
Research and development 948,811 1,279,744 2,032,734 2,328,119
Total operating expenses 3,681,151 3,755,122 7,586,599 7,554,505
Income from operations 328,741 1,435,386 1,025,398 2,725,261
Other income 69,602 17,608 165,662 56,676
Income before income taxes 398,343 1,452,994 1,191,060 2,781,937
Income tax expense 96,768 274,144 269,158 557,147
Net income $ 301,575 $ 1,178,850 $ 921,902 $ 2,224,790
Net income per common share - basic and diluted (in dollars per share) $ 0.01 $ 0.04 $ 0.03 $ 0.07
Weighted average common shares outstanding:        
Basic (in shares) 33,094,596 32,584,952 33,036,786 32,738,871
Diluted (in shares) 33,732,619 33,077,255 33,708,832 33,272,164
Product [Member]        
Revenues:        
Revenues $ 7,553,481 $ 9,340,523 $ 15,561,419 $ 18,688,691
Service [Member]        
Revenues:        
Revenues $ 723,292 $ 851,168 $ 1,497,056 $ 1,680,559