Accounts Receivable (Details) - USD ($) $ in Thousands		Apr. 30, 2016	Oct. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contract Receivable		$ 8,907	$ 19,331
Unbilled Contracts Receivable		30,790	37,949
Commercial Customers accounts receivable		39,697	57,280
Government Contract Receivable		670	433
Government Contract Receivable, Unbilled Amounts		3,322	3,077
U.S. Government accounts receivable total	[1]	3,992	3,510
Accounts Receivable, Net, Current		43,689	60,790
Allowance for Doubtful Accounts Receivable, Current		200	500
POSCO Energy [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Related Parties, Current		7,800	34,400
NRG Energy, Inc. [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Related Parties, Current		0	0
Government [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
U.S. Government accounts receivable total		$ 3,000	$ 2,600

[1] Total U.S. Government accounts receivable outstanding as of April 30, 2016 and October 31, 2015 was $3.0 million and $2.6 million, respectively.