Warranty Liability (Tables)

12 Months Ended

Sep. 30, 2016

Payables and Accruals [Abstract]

Schedule of Product Warranty Liability [Table Text Block]

Changes in the Company's warranty liability (included in accrued expenses) for the fiscal years ended September 30, 2016 and 2015 were as follows:

	2016			2015
Balance at beginning of year	$	650,000		$	849,000
Provision for warranties	423,000			171,000
Expenses incurred	(392,000		)	(370,000		)
Balance at end of year	$	681,000		$	650,000