Product Warranties (Details) - USD ($)	3 Months Ended		9 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Mar. 31, 2017	Sep. 30, 2016	Mar. 31, 2016	Sep. 30, 2015
Product Warranties [Abstract]
Balance at beginning of period	$ 650,000	$ 650,000	$ 650,000	$ 650,000	$ 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)