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Accounts Receivable (Details) - USD ($)
$ in Thousands
Oct. 31, 2015
Oct. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Government Contract Receivable $ 433 $ 2,517
U.S. Government Unbilled Recoverable Costs 3,077 2,886
U.S. Government Accounts Receivable Total 3,510 5,403
Commercial Customers Unbilled Recoverable Costs 37,949 50,101
Commercial Customers Accounts Receivable Total 57,280 58,972
Accounts receivable, net of allowance for doubtful accounts of $544 and $132 at October 31, 2015 and 2014, respectively 60,790 64,375
Allowance for Doubtful Accounts Receivable, Current 544 132
Commercial Customers Amount Billed 19,331 8,871
NRG Energy, Inc. [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts Receivable, Related Parties, Current 0 5,500
POSCO Energy [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts Receivable, Related Parties, Current 34,400 29,900
Government [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
U.S. Government Accounts Receivable Total $ 2,600 $ 1,700