Product Warranties (Details) - USD ($)	3 Months Ended		6 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014
Product Warranties [Abstract]
Balance at beginning of period	$ 650,000	$ 836,000	$ 650,000	$ 836,000	$ 650,000	$ 650,000	$ 837,000	$ 849,000
Provision for warranties	110,000	121,000	218,000	249,000
Expenses incurred	$ (110,000)	$ (122,000)	$ (218,000)	$ (262,000)