Accounts Receivable (Details) - USD ($) $ in Thousands		Jul. 31, 2015	Oct. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contract Receivable		$ 16,629	$ 8,871
Unbilled Contracts Receivable		32,541	50,101
Commercial Customers accounts receivable		49,170	58,972
Government Contract Receivable		2,500	2,517
Government Contract Receivable, Unbilled Amounts		3,645	2,886
U.S. Government accounts receivable total	[1]	6,145	5,403
Accounts Receivable, Net, Current		55,315	64,375
Allowance for Doubtful Accounts Receivable, Current		200	100
POSCO Energy [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Related Parties, Current		26,100	29,900
NRG Energy, Inc. [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Related Parties, Current		100
Government [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Government Contract Receivable		$ 3,600	$ 1,700

[1] Total U.S. Government accounts receivable outstanding as of July 31, 2015 and October 31, 2014 was $3.6 million and $1.7 million, respectively.