Note 2 Summary of Significant Accounting Policies (Allowance for Ship and Debit) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Allowance for Accounts Receivable Ship And Debit [Roll Forward]
Beninning Balance	$ 1,071	$ 1,396	$ 1,101
Additions	5,765	4,757	5,842
Deductions	(5,777)	(5,082)	(5,547)
Ending Balance	$ 1,059	$ 1,071	$ 1,396