Note 2 Summary of Significant Accounting Policies (Allowance for Ship and Debit) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Allowance for Accounts Receivable Ship And Debit [Roll Forward]
Beninning Balance	$ 1,101	$ 1,400	$ 1,419
Additions	5,842	5,858	5,467
Deductions	(5,547)	(6,157)	(5,486)
Ending Balance	$ 1,396	$ 1,101	$ 1,400