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Debt and Finance Obligation (Details) - USD ($)
3 Months Ended 12 Months Ended
Jan. 31, 2017
Oct. 31, 2016
Nov. 30, 2016
Mar. 05, 2013
Debt Instrument [Line Items]        
Capital Lease Obligations $ 774,000 $ 660,000    
Debt Issuance Costs, Net (1,459,000) (1,408,000)    
Total debt 88,049,000 81,770,000    
Current portion of long-term debt and finance obligation 9,428,000 5,010,000    
Long-term debt $ 78,621,000 76,760,000    
Lease Payment Terms 36 months      
Hercules Capital, Inc. [Member]        
Debt Instrument [Line Items]        
Long-term Line of Credit $ 20,760,000 20,521,000    
Line of Credit Facility, Maximum Borrowing Capacity $ 25,000,000      
Proceeds from Issuance of Debt   20,000,000    
Term of loan 30 months      
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum 9.50%      
Other Deductions and Charges $ 1,700,000      
Debt Instrument, Covenant Description The loan contains a financial covenant whereby the Company is required to maintain an unrestricted cash balance of at least (a) 75% of the outstanding Loan balance plus (b) the amount of accounts payable (as defined under GAAP) not paid within 90 days of the date payment was issued.      
PNC Energy Capital, LLC [Member]        
Debt Instrument [Line Items]        
Long-term Line of Credit $ 47,252,000 41,603,000    
State of Connecticut [Member]        
Debt Instrument [Line Items]        
Term of loan 15 years      
Debt Instrument, Interest Rate, Stated Percentage 2.00%      
NRG Energy [Member]        
Debt Instrument [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity $ 40,000,000      
Connecticut Development Authority Note [Member]        
Debt Instrument [Line Items]        
Long-term Line of Credit 2,530,000 2,589,000    
Collateralized Agreements 4,000,000      
Debt Instrument, Face Amount $ 4,000,000      
Debt Instrument, Interest Rate, Stated Percentage 5.00%      
Connecticut Clean Energy Fund [Member]        
Debt Instrument [Line Items]        
Long-term Line of Credit $ 6,052,000 6,050,000    
Line of Credit Facility, Maximum Borrowing Capacity       $ 5,900,000
Debt Instrument, Interest Rate, Stated Percentage       5.00%
NRG Energy, Inc. [Member]        
Debt Instrument [Line Items]        
Long-term Line of Credit 0 1,755,000    
New Britain Renewable Energy Member [Member]        
Debt Instrument [Line Items]        
Notes Payable to Bank, Current $ 2,140,000 0 $ 2,300,000  
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum 5.00%      
CT Dept of Economic & Community Development [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Face Amount $ 10,000,000 $ 10,000,000    
Second Tranche [Member] | Hercules Capital, Inc. [Member]        
Debt Instrument [Line Items]        
Loan Advance $ 5,000,000      
Maximum [Member] | NRG Energy [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum 8.50%      
Minimum [Member] | NRG Energy [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum 8.00%