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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
 3 Months Ended 6 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Revenues:        
Product sales $ 3,339,707 $ 4,252,815 $ 5,903,514 $ 8,398,887
Contract and other 262,267 233,415 519,992 472,771
Total revenues 3,601,974 4,486,230 6,423,506 8,871,658
Cost of revenues 1,970,512 2,189,425 3,493,682 4,215,696
Gross profit 1,631,462 2,296,805 2,929,824 4,655,962
Operating expenses:        
Selling, general and administrative 2,276,694 1,466,197 3,736,786 2,868,219
Research and development 597,635 569,418 1,158,837 1,047,122
Total operating expenses 2,874,329 2,035,615 4,895,623 3,915,341
(Loss) income from operations (1,242,867) 261,190 (1,965,799) 740,621
Other income 31,693 30,921 64,957 57,124
(Loss) income from operations before income taxes (1,211,174) 292,111 (1,900,842) 797,745
Income tax (benefit) expense (546,511) 1,600 (856,106) 1,600
Net (loss) income $ (664,663) $ 290,511 $ (1,044,736) $ 796,145
Net (loss) income per common share        
- basic and diluted (in dollars per share) $ (0.02) $ 0.01 $ (0.03) $ 0.02
Weighted average common shares outstanding:        
Basic (in shares) 31,828,167 33,253,719 32,146,928 33,244,929
Diluted (in shares) 31,828,167 33,847,965 32,146,928 33,816,805
Cash dividends declared per common share (in dollars per share) $ 0.01 $ 0.02