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Discontinued Operations (Narrative) (Details) - USD ($)
1 Months Ended 12 Months Ended
Dec. 22, 2015
Dec. 31, 2015
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
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          
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     200,000
Gain on lease termination         300,000
New Mexico | Discontinued Operations, Disposed of by Sale          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Incentive tax credits     $ 0 $ 0  
Sumitomo Electric Industries, LTD          
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 | Discontinued Operations, Disposed of by Sale          
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