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Condensed Consolidated Statements of Operations (Unaudited) (USD $)
 3 Months Ended 6 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
Mar. 31, 2012
Revenues:        
Product sales $ 2,887,467 $ 2,340,731 $ 5,649,812 $ 5,885,784
Contract and other 302,343 59,710 520,105 126,292
Total revenues 3,189,810 2,400,441 6,169,917 6,012,076
Cost of revenues 1,827,741 1,083,438 3,322,025 2,946,479
Gross profit 1,362,069 1,317,003 2,847,892 3,065,597
Operating expenses:        
Selling, general and administrative 1,370,259 1,193,294 2,542,734 2,249,853
Research and development 456,747 429,390 878,668 810,708
Total operating expenses 1,827,006 1,622,684 3,421,402 3,060,561
(Loss) income from operations (464,937) (305,681) (573,510) 5,036
Other income 7,159 6,778 15,356 19,722
(Loss) income from operations before income taxes (457,778) (298,903) (558,154) 24,758
Income tax expense (benefit) 1,600 (7,015) 1,600 2,700
Net (loss) income $ (459,378) $ (291,888) $ (559,754) $ 22,058
Net (loss) income per common share - basic and diluted $ (0.01) $ (0.01) $ (0.02)  
Weighted average common shares outstanding:        
Basic 32,399,199 32,374,499 32,397,168 32,374,499
Diluted 32,399,199 32,374,499 32,397,168 33,006,994