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Debt (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jul. 31, 2015
Jul. 31, 2015
Oct. 31, 2014
Mar. 05, 2013
Debt Instrument [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity $ 4,000 $ 4,000    
Long-term Line of Credit 2,945 2,945 $ 945  
Capital Lease Obligations 825 825 721  
Long-term Debt, Current Maturities $ 6,908 $ 6,908 1,439  
Lease Payment Terms 36 months      
London Interbank Offered Rate (LIBOR) [Member]        
Debt Instrument [Line Items]        
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate 1.50% 1.50%    
NRG Energy [Member]        
Debt Instrument [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity $ 40,000 $ 40,000    
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum   8.50%    
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum   8.00%    
Long-term Line of Credit 3,326 $ 3,326 0  
Connecticut Development Authority Note [Member]        
Debt Instrument [Line Items]        
Collateralized Agreements 4,000 4,000    
Long-term Line of Credit 2,873 2,873 3,033  
Debt Instrument, Face Amount $ 4,000 $ 4,000    
Debt Instrument, Interest Rate, Stated Percentage 5.00% 5.00%    
Connecticut Clean Energy Fund [Member]        
Debt Instrument [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity       $ 5,900
Connecticut Clean Energy and Finance Investment Authority [Member]        
Debt Instrument [Line Items]        
Long-term Line of Credit $ 6,052 $ 6,052 $ 6,052  
Debt Instrument, Interest Rate, Stated Percentage 5.00% 5.00%