Product Warranties (Tables)

9 Months Ended

Jun. 30, 2017

Product Warranties [Abstract]

Schedule of Product Warranty Liability [Table Text Block]

Changes in the Company's warranty liability (included in accrued expenses) for the three and nine month periods ended June 30, 2017 and 2016 were as follows:

	Three Months Ended June 30,						Nine Months Ended June 30,
	2017			2016			2017			2016
Balance at beginning of period	$	650,000		$	650,000		$	650,000		$	650,000
Provision for warranties	107,000			106,000			323,000			324,000
Expenses incurred	(107,000		)	(106,000		)	(323,000		)	(324,000		)
Balance at end of period	$	650,000		$	650,000		$	650,000		$	650,000