Note 1 - Summary of Significant Accounting Policies (Detail) (USD $)	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Sales Revenue, Goods, Net, Percentage	3.00%
Provision for Doubtful Accounts	$ 200,000	$ 100,000	$ 500,000
Sales Revenue, Goods, Net	186,337,000	151,686,000
Concentration Risk, Percentage	10.00%
Inventory Valuation Reserves	400,000	700,000
Research and Development Expense	7,046,000	8,578,000	8,207,000
Hungary [Member]
Segment Reporting Information, Net Assets	135,000,000
Vestas Wind Systems [Member]
Sales Revenue, Goods, Net, Percentage	46.50%	38.60%	28.10%
Sales Revenue, Goods, Net	86,600,000	42,700,000	49,500,000
Accounts Receivable, Gross	22,300,000	15,000,000
Saertex GMBH [Member]
Sales Revenue, Goods, Net, Percentage	10.40%
Sales Revenue, Goods, Net	$ 15,800,000
Hungary [Member]
Foreign Currency Translation Rate Change Percentage	3.00%