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CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($)
 3 Months Ended 6 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Net sales:        
Product $ 8,455,235 $ 3,487,933 $ 14,395,646 $ 8,037,453
Engineering development contracts 205,747 1,798,117 848,915 3,972,853
Total net sales 8,660,982 5,286,050 15,244,561 12,010,306
Cost of sales:        
Product 3,061,780 2,376,434 5,970,738 4,617,987
Engineering development contracts (304,145) 1,326,220 54,665 3,047,118
Total cost of sales 2,757,635 3,702,654 6,025,403 7,665,105
Gross profit 5,903,347 1,583,396 9,219,158 4,345,201
Operating expenses:        
Research and development 1,337,616 647,473 2,269,216 1,302,472
Selling, general and administrative 2,592,615 1,573,888 5,285,559 3,514,379
Total operating expenses 3,930,231 2,221,361 7,554,775 4,816,851
Operating income (loss) 1,973,116 (637,965) 1,664,383 (471,650)
Interest income 8,340 6,013 15,366 11,898
Other income 26,623 9,407 59,032 20,229
Income (loss) before income taxes 2,008,079 (622,545) 1,738,781 (439,523)
Income tax expense (benefit) 429,766 (258,454) 375,906 (669,174)
Net income (loss) $ 1,578,313 $ (364,091) $ 1,362,875 $ 229,651
Net income (loss) per common share:        
Basic (in dollars per share) $ 0.09 $ (0.02) $ 0.08 $ 0.01
Diluted (in dollars per share) $ 0.09 $ (0.02) $ 0.08 $ 0.01
Weighted average shares outstanding:        
Basic (in shares) 16,925,719 16,925,028 16,917,679 16,940,377
Diluted (in shares) 17,018,161 16,925,028 17,009,299 17,043,735