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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Sep. 30, 2014
Jun. 30, 2013
Schedule of Equity Method Investments [Line Items]      
Asset retirement obligations $ 1,774 $ 4,543  
Suncore Photovoltaic Technology Co., Ltd. [Member]      
Schedule of Equity Method Investments [Line Items]      
Equity method investment, ownership percentage     40.00%
Equity method investment, purchase price     $ 4,800