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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)
 3 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Net sales:    
Product $ 4,022,052 $ 6,457,874
Engineering - modification and development 733,407 71,937
Total net sales 4,755,459 6,529,811
Cost of sales    
Product 2,043,266 2,897,272
Engineering - modification and development 586,594 38,383
Total cost of sales 2,629,860 2,935,655
Gross profit 2,125,599 3,594,156
Operating expenses:    
Research and development 790,223 1,353,607
Selling, general and administrative 1,993,575 2,089,349
Total operating expenses 2,783,798 3,442,956
Operating income (loss) (658,199) 151,200
Interest income 21,779 47,592
Interest (expense) (237) (458)
Other income 42,069 150,003
Income (loss) before income taxes (594,588) 348,337
Income tax expense (benefit) (251,609) 63,557
Net income (loss) $ (342,979) $ 284,780
Net income (loss) per common share:    
Basic (in dollars per share) $ (0.02) $ 0.02
Diluted (in dollars per share) $ (0.02) $ 0.02
Weighted Average Shares Outstanding:    
Basic (in shares) 16,721,494 16,770,415
Diluted (in shares) 16,721,494 16,810,278