Product Warranties (Details) - USD ($)	3 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Sep. 30, 2017	Sep. 30, 2016
Product Warranties [Abstract]
Balance at beginning of period	$ 431,000	$ 650,000	$ 431,000	$ 650,000
Provision for warranties	83,000	114,000
Expenses incurred	$ (83,000)	$ (114,000)