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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
 3 Months Ended 9 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Sales:        
Returns and allowances       $ (556,009)
Total net sales $ 3,389,663 $ 4,541,421 $ 10,204,851 12,561,191
Cost of sales:        
Total cost of sales 1,806,980 2,164,140 5,482,596 6,294,623
Gross profit 1,582,683 2,377,281 4,722,255 6,266,568
Operating expenses:        
Research and development 1,028,271 1,236,184 2,983,614 3,391,181
Selling, general and administrative 1,626,640 1,682,286 5,005,941 2,025,952
Total operating expenses 2,654,911 2,918,470 7,989,555 5,417,133
Operating (loss) income (1,072,228) (541,189) (3,267,300) 849,435
Interest income 15,164 7,682 36,469 27,505
Other income 16,128 15,628 53,224 4,174,953
(Loss) income before income taxes (1,040,936) (517,879) (3,177,607) 5,051,893
Income tax expense (benefit) 101 (537,099) 61,920 297,220
Net (loss) income $ (1,041,037) $ 19,220 $ (3,239,527) $ 4,754,673
Net (loss) income per common share:        
Basic (in dollars per share) $ (0.06) $ 0.00 $ (0.19) $ 0.28
Diluted (in dollars per share) $ (0.06) $ 0.00 $ (0.19) $ 0.28
Weighted average shares outstanding:        
Basic (in shares) 16,816,838 16,755,082 16,800,070 16,735,533
Diluted (in shares) 16,816,838 16,870,404 16,800,070 16,847,305
Product        
Sales:        
Product $ 3,201,325 $ 4,476,717 $ 9,975,011 $ 12,566,311
Cost of sales:        
Total cost of sales 1,714,701 2,074,500 5,380,094 5,996,291
Engineering development contracts        
Sales:        
Engineering development contracts 188,338 64,704 229,840 550,889
Cost of sales:        
Total cost of sales $ 92,279 $ 89,640 $ 102,502 $ 298,332