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CONSOLIDATED STATEMENTS OF INCOME - USD ($)
 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Net sales:      
Product $ 26,985,899 $ 14,573,475 $ 29,975,410
Engineering development contracts 983,804 5,493,609 14,119,613
Total net sales 27,969,703 20,067,084 44,095,023
Cost of sales:      
Product 11,112,339 8,417,571 15,050,608
Engineering development contracts 369,984 4,717,778 15,458,215
Total cost of sales 11,482,323 13,135,349 30,508,823
Gross profit 16,487,380 6,931,735 13,586,200
Operating expenses:      
Research and development 4,873,328 2,705,208 2,618,054
Selling, general and administrative 9,170,865 7,847,270 11,111,014
Total operating expenses 14,044,193 10,552,478 13,729,068
Operating income (loss) 2,443,187 (3,620,743) (142,868)
Interest income 33,504 24,804 21,756
Other income 78,440 33,283 37,758
Income (loss) before income taxes 2,555,131 (3,562,656) (83,354)
Income tax (benefit) expense 568,330 2,303,478 (283,622)
Net income (loss) $ 1,986,801 $ (5,866,134) $ 200,268
Net income (loss) per common share:      
Basic (in dollars per share) $ 0.12 $ (0.35) $ 0.01
Diluted (in dollars per share) $ 0.12 $ (0.35) $ 0.01
Weighted average shares outstanding:      
Basic (in shares) 16,927,055 16,924,189 16,927,879
Diluted (in shares) 17,039,296 16,924,189 17,149,106