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CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)
 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Net sales:      
Product $ 23,459,034 $ 18,289,963 $ 25,174,846
Engineering development contracts 8,108,273 6,288,235 562,806
Total net sales 31,567,307 24,578,198 25,737,652
Cost of sales:      
Product 10,601,057 9,389,904 11,790,885
Engineering development contracts 8,341,680 4,678,029 154,299
Total cost of sales 18,942,737 14,067,933 11,945,184
Gross profit 12,624,570 10,510,265 13,792,468
Operating expenses:      
Research and development 2,578,034 2,693,554 5,500,924
Selling, general and administrative 8,119,071 7,400,199 7,683,637
Total operating expenses 10,697,105 10,093,753 13,184,561
Operating income 1,927,465 416,512 607,907
Interest income 41,174 101,012 143,942
Interest (expense)   (598) (1,509)
Other income 38,120 65,005 150,010
Income before income taxes 2,006,759 581,931 900,350
Income tax (benefit) expense 119,842 (2,397,063) 183,760
Net income $ 1,886,917 $ 2,978,994 $ 716,590
Net income per common share:      
Basic (in dollars per share) $ 0.11 $ 0.18 $ 0.04
Diluted (in dollars per share) $ 0.11 $ 0.18 $ 0.04
Cash dividend per share (in dollars per share) $ 1.50    
Weighted average shares outstanding:      
Basic (in shares) 16,753,068 16,641,895 16,782,223
Diluted (in shares) 16,855,854 16,641,900 16,824,621