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Discontinued Operations (Narrative) (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Dec. 22, 2015
Dec. 31, 2015
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Oct. 22, 2014
Sep. 17, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Payments to terminate lease agreement           $ 200,000    
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     $ 0 $ 0   0    
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       9,200 $ 0 100,000    
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   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]                
Gain on settlement       3,800,000   3,800,000    
Write off of loss accrual       $ 400,000   $ 400,000