Note 13 Related Party Transactions (Narratives) (Details) (USD $)	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Powersem GmbH [Member]
Related Party Transaction [Line Items]
Equity Method Investment, Ownership Percentage	45.00%
Related Party Transaction, Revenue from Related Parties	$ 2,100,000	$ 1,300,000	$ 2,700,000
Related Party Transaction, Expenses from Transactions with Related Party	5,200,000	2,900,000	5,500,000
Accounts Receivable, Related Parties	74,000	121,000	161,000
Accounts Payable, Related Parties	137,000	59,000	296,000
Related Party Transaction, Other Revenues from Transactions with Related Party	43,000
EB Tech Ltd [Member]
Related Party Transaction [Line Items]
Equity Method Investment, Ownership Percentage	20.00%
Related Party Transaction, Expenses from Transactions with Related Party	211,000	121,000
Accounts Payable, Related Parties	$ 0