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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
 3 Months Ended 9 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Sales:        
Total net sales $ 4,589,824 $ 3,389,663 $ 12,770,601 $ 10,204,851
Cost of sales:        
Total cost of sales 2,064,617 1,806,980 5,733,385 5,482,596
Gross profit 2,525,207 1,582,683 7,037,216 4,722,255
Operating expenses:        
Research and development 722,525 1,028,271 1,967,379 2,983,614
Selling, general and administrative 1,416,053 1,626,640 4,414,126 5,005,941
Total operating expenses 2,138,578 2,654,911 6,381,505 7,989,555
Operating income (loss) 386,629 (1,072,228) 655,711 (3,267,300)
Interest income 99,916 15,164 147,948 36,469
Other income 24,714 16,128 57,314 53,224
Income (loss) before income taxes 511,259 (1,040,936) 860,973 (3,177,607)
Income tax expense 0 101 7,794 61,920
Net income (loss) $ 511,259 $ (1,041,037) $ 853,179 $ (3,239,527)
Net income(loss) per common share:        
Basic (in dollars per share) $ 0.03 $ (0.06) $ 0.05 $ (0.19)
Diluted (in dollars per share) $ 0.03 $ (0.06) $ 0.05 $ (0.19)
Weighted average shares outstanding:        
Basic (in shares) 16,880,341 16,816,838 16,860,503 16,800,070
Diluted (in shares) 16,978,643 16,816,838 16,898,321 16,800,070
Product        
Sales:        
Total net sales $ 4,458,446 $ 3,201,325 $ 11,940,865 $ 9,975,011
Cost of sales:        
Total cost of sales 2,009,799 1,714,701 5,300,941 5,380,094
Engineering development contracts        
Sales:        
Total net sales 131,378 188,338 829,736 229,840
Cost of sales:        
Total cost of sales $ 54,818 $ 92,279 $ 432,444 $ 102,502