Product Warranties (Tables)

3 Months Ended

Dec. 31, 2015

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 month periods ended December 31, 2015 and 2014 were as follows:

	Three Months Ended December 31,
	2015			2014
Balance at beginning of period	$	650,000		$	849,000
Provision for warranties	108,000			128,000
Expenses incurred	(108,000		)	(140,000		)
Balance at end of period	$	650,000		$	837,000