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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
 3 Months Ended 6 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2022
Mar. 31, 2021
Net Sales:        
Total net sales $ 6,845,820 $ 5,121,845 $ 13,541,598 $ 9,991,497
Cost of sales:        
Total cost of sales 2,663,210 2,218,854 5,391,267 4,522,683
Gross profit 4,182,610 2,902,991 8,150,331 5,468,814
Operating expenses:        
Research and development 650,031 689,654 1,386,556 1,289,952
Selling, general and administrative 1,724,800 1,602,118 3,531,782 3,335,272
Total operating expenses 2,374,831 2,291,772 4,918,338 4,625,224
Operating income 1,807,779 611,219 3,231,993 843,590
Interest income 346 152 442 1,031
Other income 11,555 17,371 27,793 33,763
Income before income taxes 1,819,680 628,742 3,260,228 878,384
Income tax expense 390,110 20,165 697,600 29,662
Net income $ 1,429,570 $ 608,577 $ 2,562,628 $ 848,722
Net income per common share:        
Basic (in dollars per share) $ 0.08 $ 0.04 $ 0.15 $ 0.05
Diluted (in dollars per share) $ 0.08 $ 0.04 $ 0.15 $ 0.05
Weighted average shares outstanding:        
Basic (in shares) 17,253,746 17,222,165 17,250,059 17,218,275
Diluted (in shares) 17,253,746 17,223,998 17,250,059 17,220,143
Product        
Net Sales:        
Total net sales $ 6,647,617 $ 5,102,670 $ 13,343,395 $ 9,905,505
Cost of sales:        
Total cost of sales 2,646,462 2,211,649 5,374,519 4,505,943
Engineering development contracts        
Net Sales:        
Total net sales 198,203 19,175 198,203 85,992
Cost of sales:        
Total cost of sales $ 16,748 $ 7,205 $ 16,748 $ 16,740