Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Sep. 30, 2015
Income Tax Disclosure [Abstract]
Net operating loss	$ 10,453	$ 9,877
Uniform capitalization and inventory	1,596	1,895
Deferred compensation	1,853	1,848
Stock-based compensation	760	993
Reserve for accrued employee benefits	1,679	1,482
Warranty accrual	1,388	915
Goodwill	345	398
Postretirement benefits liability	503
Allowance for doubtful accounts	220	166
Accrued legal	294	60
Credit carryforwards	1,292	1,329
Other	171	8
Deferred tax assets	20,554	18,971
Depreciation and amortization	(8,247)	(2,705)
Other		(12)
Deferred tax liabilities	(8,247)	(2,717)
Less: valuation allowance	(8,439)	(10,056)
Net deferred income tax asset	$ 3,868	$ 6,198