Product Warranties (Tables)

6 Months Ended

Mar. 31, 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 six month periods ended March 31, 2016 and 2015 were as follows:

	Three Months Ended March 31,						Six Months Ended March 31,
	2016			2015			2016			2015
Balance at beginning of period	$	650,000		$	837,000		$	650,000		$	849,000
Provision for warranties	110,000			121,000			218,000			249,000
Expenses incurred	(110,000		)	(122,000		)	(218,000		)	(262,000		)
Balance at end of period	$	650,000		$	836,000		$	650,000		$	836,000