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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
 3 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Revenues:    
Product sales $ 2,701,959 $ 2,563,807
Contract and other 239,375 257,725
Total revenues 2,941,334 2,821,532
Cost of revenues 1,716,824 1,523,170
Gross profit 1,224,510 1,298,362
Operating expenses:    
Selling, general and administrative 1,966,436 1,460,092
Research and development 587,410 561,202
Total operating expenses 2,553,846 2,021,294
Loss from operations (1,329,336) (722,932)
Other income 30,128 33,264
Loss from operations before income taxes (1,299,208) (689,668)
Income tax benefit (486,528) (309,595)
Net loss $ (812,680) $ (380,073)
Net loss per common share - basic and diluted (in dollars per share) $ (0.03) $ (0.01)
Weighted average common shares outstanding: - basic and diluted (in shares) 31,800,103 32,462,220
Cash dividends declared per common share (in dollars per share) $ 0 $ 0.01