Note 11 - Contingencies (Detail) (USD $)	1 Months Ended	3 Months Ended	6 Months Ended			6 Months Ended		1 Months Ended		1 Months Ended
	Dec. 21, 2012	Mar. 31, 2012	Mar. 31, 2013	Sep. 30, 2012	Dec. 31, 2001	Mar. 31, 2013 Minimum [Member]	Mar. 31, 2013 Maximum [Member]	Dec. 21, 2012 Settlement Administrative Expenses [Member]	Mar. 31, 2013 Patents [Member]	Feb. 28, 2011 Awarded Damages [Member]	May 31, 2011 Prejudegement Interest [Member]	May 31, 2011 Attorney Fees [Member]	May 31, 2011 Court Costs [Member]
Litigation Settlement, Gross	$ 500,000	$ 12,500,000						$ 25,000
Finite-lived Intangible Assets, Fair Value Disclosure					164,400,000
Finite-Lived Intangible Assets, Net			161,600,000	193,400,000					12,000,000
Payments for Legal Settlements										2,200,000	1,300,000	1,000,000	132,000
Guarantor Obligations			14,300,000
Letters of Credit Outstanding, Amount			$ 8,900,000
Warranty Period						90 days	180 years
Warranty Period						90 days	180 years