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Consolidated Statements of Operations - USD ($)
 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Revenues:    
Product sales $ 15,305,942 $ 15,800,800
Contract and other 1,055,063 983,420
Total revenues 16,361,005 16,784,220
Cost of revenues 8,689,484 8,255,663
Gross profit 7,671,521 8,528,557
Operating expenses:    
Selling, general and administrative 6,876,792 5,280,704
Research and development 2,387,985 2,028,539
Total operating expenses 9,264,777 7,309,243
(Loss) income from operations (1,593,256) 1,219,314
Other income 125,497 121,836
(Loss) income from operations before income taxes (1,467,759) 1,341,150
Income tax benefit (186,160) (8,346,666)
Net (loss) income $ (1,281,599) $ 9,687,816
Net (loss) income per common share - basic and diluted (in dollars per share) $ (0.04) $ 0.29
Weighted average common shares outstanding:    
Basic (in shares) 31,970,600 33,174,546
Diluted (in shares) 31,970,600 33,574,919
Cash dividends declared per common share (in dollars per share) $ 0.03