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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
 3 Months Ended 6 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Revenues:        
Product sales $ 5,471,613 $ 3,339,707 $ 8,173,572 $ 5,903,514
Contract and other 270,778 262,267 510,154 519,992
Total revenues 5,742,391 3,601,974 8,683,726 6,423,506
Cost of revenues 2,808,546 1,970,512 4,525,370 3,493,682
Gross profit 2,933,845 1,631,462 4,158,356 2,929,824
Operating expenses:        
Selling, general and administrative 1,893,045 2,276,694 3,859,480 3,736,786
Research and development 605,239 597,635 1,192,650 1,158,837
Total operating expenses 2,498,284 2,874,329 5,052,130 4,895,623
Income (loss) from operations 435,561 (1,242,867) (893,774) (1,965,799)
Other income 32,074 31,693 62,202 64,957
Income (loss) from operations before income taxes 467,635 (1,211,174) (831,572) (1,900,842)
Income tax expense (benefit) 169,285 (546,511) (317,243) (856,106)
Net income (loss) $ 298,350 $ (664,663) $ (514,329) $ (1,044,736)
Net income (loss) per common share - basic and diluted (in dollars per share) $ 0.01 $ (0.02) $ (0.02) $ (0.03)
Weighted average common shares outstanding:        
Basic (in shares) 31,800,103 31,828,167 31,800,103 32,146,928
Diluted (in shares) 31,863,902 31,828,167 31,800,103 32,146,928
Cash dividends declared per common share (in dollars per share) $ 0.01 $ 0 $ 0.02