Intangible Assets (Narrative) (Details) (USD $)	3 Months Ended		6 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013	Sep. 30, 2013
Finite Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 121,000	$ 413,000	$ 536,000	$ 828,000
Cash received from amended supply agreement			10,000,000
Long term receivable	4,667,000		4,667,000
Deferred credit amortization period			4 years
Gain on amended supply agreement			507,000
Supply Agreement
Finite Lived Intangible Assets [Line Items]
Useful life of intangible assets			15 years
General Electric Company
Finite Lived Intangible Assets [Line Items]
Additional amount paid on execution of agreement			7,000,000
Acquired finite-lived intangible assets, period			3 years
Other current assets	2,300,000		2,300,000
Deferred credit	$ 8,100,000		$ 8,100,000