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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
 3 Months Ended 6 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Sales:        
Returns and allowances   $ (97,829)   $ (556,009)
Total net sales $ 3,727,204 4,653,902 $ 6,815,188 8,019,769
Cost of sales:        
Total cost of sales 2,082,347 2,302,431 3,675,616 4,130,483
Gross profit 1,644,857 2,351,471 3,139,572 3,889,286
Operating expenses:        
Research and development 1,031,622 1,069,009 1,955,343 2,154,997
Selling, general and administrative 1,756,746 (1,703,456) 3,379,301 343,666
Total operating expenses 2,788,368 (634,447) 5,334,644 2,498,663
Operating (loss) income (1,143,511) 2,985,918 (2,195,072) 1,390,623
Interest income 11,681 9,947 21,305 19,823
Other income 15,664 4,140,210 37,096 4,159,326
(Loss) income before income taxes (1,116,166) 7,136,075 (2,136,671) 5,569,772
Income tax expense 200,705 1,205,650 61,819 834,319
Net (loss) income $ (1,316,871) $ 5,930,425 $ (2,198,490) $ 4,735,453
Net (loss) income per common share:        
Basic (in dollars per share) $ (0.08) $ 0.35 $ (0.13) $ 0.28
Diluted (in dollars per share) $ (0.08) $ 0.35 $ (0.13) $ 0.28
Weighted average shares outstanding:        
Basic (in shares) 16,800,244 16,735,503 16,791,687 16,725,759
Diluted (in shares) 16,800,244 16,847,059 16,791,687 16,835,756
Product        
Sales:        
Product $ 3,685,702 $ 4,614,422 $ 6,773,686 $ 8,089,593
Cost of sales:        
Total cost of sales 2,072,124 2,181,087 3,665,393 3,921,791
Engineering development contracts        
Sales:        
Engineering development contracts 41,502 137,309 41,502 486,185
Cost of sales:        
Total cost of sales $ 10,223 $ 121,344 $ 10,223 $ 208,692