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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
 3 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Net sales:    
Total net sales $ 4,511,428 $ 3,977,650
Cost of sales:    
Total cost of sales 1,909,781 1,811,847
Gross profit 2,601,647 2,165,803
Operating expenses:    
Research and development 666,615 596,372
Selling, general and administrative 1,703,274 1,473,416
Total operating expenses 2,369,889 2,069,788
Operating income 231,758 96,015
Interest income 78,870 21,552
Other income 17,280 21,854
Income before income taxes 327,908 139,421
Income tax expense 0 0
Net income $ 327,908 $ 139,421
Net income per common share:    
Basic (in dollars per share) $ 0.02 $ 0.01
Diluted (in dollars per share) $ 0.02 $ 0.01
Weighted average shares outstanding:    
Basic (in shares) 16,909,036 16,840,599
Diluted (in shares) 17,081,578 16,840,599
Product    
Net sales:    
Total net sales $ 4,458,694 $ 3,775,509
Cost of sales:    
Total cost of sales 1,844,480 1,723,281
Engineering development contracts    
Net sales:    
Total net sales 52,734 202,141
Cost of sales:    
Total cost of sales $ 65,301 $ 88,566