Accounts Receivable (Details) - USD ($) $ in Thousands	Oct. 31, 2016	Oct. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Government Contract Receivable	$ 2,463	$ 433
U.S. Government Unbilled Recoverable Costs	3,068	3,077
U.S. Government Accounts Receivable Total	5,531	3,510
Commercial Customers Unbilled Recoverable Costs	13,651	37,949
Commercial Customers Accounts Receivable Total	19,062	57,280
Accounts receivable, net of allowance for doubtful accounts of $193 and $544 at October 31, 2016 and 2015, respectively	24,593	60,790
Allowance for Doubtful Accounts Receivable, Current	193	544
Commercial Customers Amount Billed	5,411	19,331
NRG Energy, Inc. [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Related Parties, Current	100	0
POSCO Energy [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Related Parties, Current	5,000	34,400
Government [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
U.S. Government Accounts Receivable Total	$ 2,200	$ 2,600