Annual report pursuant to Section 13 and 15(d)

Inventory (Change In Inventory Reserve) (Details)

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Inventory (Change In Inventory Reserve) (Details) - USD ($)
12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Balance at October 1 $ 13,116 $ 39,752 $ 60,873
Charged to costs and expenses 345,179 (8,630) 173,634
Write-offs (45,298) (18,006) (194,755)
Balance at September 30 $ 312,997 $ 13,116 $ 39,752