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CONDENSED CONSOLIDATED STATEMENTS OF INCOME (USD $)
 3 Months Ended 9 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Net sales:        
Product $ 7,589,212 $ 6,408,931 $ 23,388,043 $ 17,994,508
Engineering development contracts 2,986,764 2,369,323 10,788,759 5,535,455
Total net sales 10,575,976 8,778,254 34,176,802 23,529,963
Cost of sales:        
Product 3,924,222 2,848,306 11,603,748 7,611,303
Engineering development contracts 3,489,627 2,484,492 11,845,367 5,481,559
Total cost of sales 7,413,849 5,332,798 23,449,115 13,092,862
Gross profit 3,162,127 3,445,456 10,727,687 10,437,101
Operating expenses:        
Research and development 647,894 559,297 1,935,692 2,215,276
Selling, general and administrative 1,854,332 2,600,659 5,633,832 6,340,900
Total operating expenses 2,502,226 3,159,956 7,569,524 8,556,176
Operating income 659,901 285,500 3,158,163 1,880,925
Interest income 5,280 8,529 16,246 32,282
Other income 7,939 4,924 27,307 29,730
Income before income taxes 673,120 298,953 3,201,716 1,942,937
Income tax expense (benefit) 176,090 (8,520) 911,874 210,751
Net income $ 497,030 $ 307,473 $ 2,289,842 $ 1,732,186
Net income per common share:        
Basic (in dollars per share) $ 0.03 $ 0.02 $ 0.14 $ 0.10
Diluted (in dollars per share) $ 0.03 $ 0.02 $ 0.13 $ 0.10
Cash dividends per share (in dollars per share):       $ 1.50
Weighted average shares outstanding:        
Basic (in shares) 16,951,360 16,790,484 16,918,423 16,725,305
Diluted (in shares) 17,177,572 16,981,285 17,141,532 16,790,518