Product Warranties (Details) - USD ($)	3 Months Ended		6 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016	Sep. 30, 2016	Dec. 31, 2015	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	102,000	110,000	216,000	218,000
Expenses incurred	$ (102,000)	$ (110,000)	$ (216,000)	$ (218,000)