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Product Warranties
 12 Months Ended
Sep. 30, 2018
Payables and Accruals [Abstract]  
Product Warranty Disclosure [Text Block]
Product Warranties

 Product warranty activity for the years ended September 30 was as follows:

 
2018
 
2017
Balance at the beginning of the period

$
121,450

 
$
130,841

Accruals for warranties for products sold in the period

26,539

 
75,816

Fulfillment of warranty obligations

(40,451
)
 
(85,207
)
Balance at the end of the period

$
107,538

 
$
121,450