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CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($)
 3 Months Ended 9 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Net sales:        
Product $ 6,376,042 $ 4,114,837 $ 20,771,687 $ 12,152,290
Engineering development contracts 128,550 804,852 977,465 4,777,705
Total net sales 6,504,592 4,919,689 21,749,152 16,929,995
Cost of sales:        
Product 2,490,681 2,300,470 8,461,419 6,918,457
Engineering development contracts 130,335 687,574 185,000 3,734,692
Total cost of sales 2,621,016 2,988,044 8,646,419 10,653,149
Gross profit 3,883,576 1,931,645 13,102,733 6,276,846
Operating expenses:        
Research and development 1,405,158 799,340 3,674,374 2,101,812
Selling, general and administrative 2,246,074 1,397,165 7,531,633 4,911,546
Total operating expenses 3,651,232 2,196,505 11,206,007 7,013,358
Operating income (loss) 232,344 (264,860) 1,896,726 (736,512)
Interest income 9,092 6,372 24,458 18,269
Other income 12,457 11,173 71,490 31,405
Income (loss) before income taxes 253,893 (247,315) 1,992,674 (686,838)
Income tax expense 27,096 3,284,658 403,002 2,615,484
Net income (loss) $ 226,797 $ (3,531,973) $ 1,589,672 $ (3,302,322)
Net income (loss) per common share:        
Basic (in dollars per share) $ 0.01 $ (0.21) $ 0.09 $ (0.20)
Diluted (in dollars per share) $ 0.01 $ (0.21) $ 0.09 $ (0.20)
Weighted average shares outstanding:        
Basic (in shares) 16,941,707 16,910,475 16,925,688 16,930,522
Diluted (in shares) 17,059,546 16,910,475 17,027,216 16,930,522