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Debt and Leases (Details) - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Oct. 31, 2015
Oct. 31, 2014
Jun. 25, 2013
Mar. 05, 2013
Debt Instrument [Line Items]        
Line of Credit Facility, Amount Outstanding $ 2,945 $ 945    
Capital Lease Obligations 726 721    
Debt, Long-term and Short-term, Combined Amount 16,303 10,751    
Long-term Debt, Current Maturities 7,358 1,439    
Long-term Debt, Excluding Current Maturities 8,945 9,312    
Long-term Debt and Capital Lease Obligations, Repayments of Principal in Next Twelve Months 4,412      
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Two 482      
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Three 2,411      
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Four 0      
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Five 0      
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal after Year Five 6,053      
Debt and Capital Leases, Future Minimum Payments Due 13,358      
Common stock issued to settle make-whole obligation, value   12,883    
Connecticut Development Authority Note [Member]        
Debt Instrument [Line Items]        
Line of Credit Facility, Amount Outstanding 2,817 3,033    
Connecticut Clean Energy Fund [Member]        
Debt Instrument [Line Items]        
Line of Credit Facility, Amount Outstanding 6,052 6,052    
Line of Credit Facility, Maximum Borrowing Capacity       $ 5,900
JPMorgan Chase Revolver [Member]        
Debt Instrument [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity $ 4,000      
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate 1.50%      
NRG Energy [Member]        
Debt Instrument [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity $ 40,000      
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum 8.50%      
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum 8.00%      
Convertible Debt [Member]        
Debt Instrument [Line Items]        
Convertible Debt   $ 38,000 $ 38,000  
Common stock issued to settle make-whole obligation, shares   500    
Common stock issued to settle make-whole obligation, value   $ 12,900    
Debt Conversion, Original Debt, Amount   $ 38,000    
Stock Issued During Period, Shares, Conversion of Convertible Securities   2,040    
embedded derivative cash payment   $ 300    
Embedded Derivative, Loss on Embedded Derivative   8,700    
NRG Energy, Inc. [Member]        
Debt Instrument [Line Items]        
Line of Credit Facility, Amount Outstanding $ 3,763 $ 0