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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
 3 Months Ended 9 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Revenues:        
Product sales $ 3,852,676 $ 4,753,898 $ 12,026,248 $ 10,657,412
Contract and other 276,878 288,271 787,032 808,263
Total revenues 4,129,554 5,042,169 12,813,280 11,465,675
Cost of revenues 2,420,126 2,601,731 6,945,496 6,095,413
Gross profit 1,709,428 2,440,438 5,867,784 5,370,262
Operating expenses:        
Selling, general and administrative 2,039,755 1,568,226 5,899,235 5,305,012
Research and development 666,244 632,416 1,858,894 1,791,253
Total operating expenses 2,705,999 2,200,642 7,758,129 7,096,265
(Loss) income from operations (996,571) 239,796 (1,890,345) (1,726,003)
Other income 32,682 30,512 94,884 95,469
(Loss) income from operations before income taxes (963,889) 270,308 (1,795,461) (1,630,534)
Income tax (benefit) expense (435,726) (6,614) (752,969) (862,720)
Net (loss) income $ (528,163) $ 276,922 $ (1,042,492) $ (767,814)
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) 31,861,916 31,798,853 31,820,632 32,028,153
Diluted (in shares) 31,861,916 31,861,308 31,820,632 32,028,153
Cash dividends declared per common share (in dollars per share) $ 0.01 $ 0 $ 0.03