Product Warranties (Tables)

9 Months Ended

Jun. 30, 2016

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, 2016 and 2015 were as follows:

	Three Months Ended June 30,						Nine Months Ended June 30,
	2016			2015			2016			2015
Balance at beginning of period	$	650,000		$	836,000		$	650,000		$	849,000
Provision for warranties	106,000			117,000			324,000			366,000
Expenses incurred	(106,000		)	(120,000		)	(324,000		)	(382,000		)
Balance at end of period	$	650,000		$	833,000		$	650,000		$	833,000