Nature of Business and Basis of Presentation (Details)	3 Months Ended
	Jan. 31, 2016	Jan. 31, 2015
POSCO Energy [Member]
Common stock ownership percentage	9.00%
significant customer revenue percentage	45.00%	54.00%
NRG Energy [Member]
Common stock ownership percentage	5.00%
significant customer revenue percentage	0.20%	5.00%