Inventories (Details) (USD $)
Apr. 30, 2013
Oct. 31, 2012
Inventories [Abstract]    
Raw materials $ 20,385,000 $ 17,683,000
Work in process 29,486,000 [1] 30,018,000 [1]
Inventory, Net 49,871,000 47,701,000
Completed Standard Component 2,900,000 11,300,000
Inventory Valuation Reserves $ 1,600,000 $ 2,400,000
[1] Work-in-process includes the standard components of inventory used to build the typical modules or stack components that are intended to be used in future power plant orders. Included in Work-in-process as of April 30, 2013 and October 31, 2012 is $2.9 million and $11.3 million, respectively, of completed standard components ready to be incorporated into power plants and deployed upon receipt of customer orders.