Inventories (Details) (USD $)	9 Months Ended
	Jul. 31, 2012		Oct. 31, 2011
Inventories [Abstract]
Inventory, Raw Materials, Net of Reserves	$ 18,642,000		$ 18,303,000
Inventory, Work in Process, Net of Reserves	30,353,000	[1]	21,798,000	[1]
Inventory, Net	48,995,000		40,101,000
Completed Standard Component	9,900,000
Inventory Valuation Reserves	3,500,000		2,600,000
Inventory Write-down	$ 1,100,000

[1] Work-in-process includes the standard components of inventory that are 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 July 31, 2012 is $9.9 million of completed standard components ready to be incorporated into power plants and deployed upon receipt of customer orders.