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Discontinued Operations (Narrative) (Details) - USD ($)
1 Months Ended 12 Months Ended
Dec. 22, 2015
Dec. 31, 2015
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Dec. 10, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Payments to terminate lease agreement       $ 200,000    
Gain on settlement     $ 0 0 $ 442,000  
Photovoltaics [Member] | Photovoltaics Business [Member]            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Asset purchase agreement, selling price           $ 150,000,000
Discontinued Operations, Disposed of by Sale [Member]            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Proceeds from sale of venture $ 700,000          
Book value of outstanding receivables $ 0          
Incentive tax credits       400,000    
Payments to terminate lease agreement   $ 200,000        
Gain on lease termination       300,000    
Discontinued Operations, Disposed of by Sale [Member] | Digital Products Business [Member]            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Asset purchase agreement, selling price         17,500,000  
Discontinued Operations, Disposed of by Sale [Member] | Photovoltaics [Member] | Photovoltaics Business [Member]            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Asset purchase agreement, selling price         149,900,000  
New Mexico [Member] | Discontinued Operations, Disposed of by Sale [Member]            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Incentive tax credits     $ 0   $ 0  
Sumitomo Electric Industries, LTD [Member]            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Gain on settlement       3,400,000    
Sumitomo Electric Industries, LTD [Member] | Discontinued Operations, Disposed of by Sale [Member]            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Write off of loss accrual       400,000    
Gain on settlement       $ 3,800,000