Schedule II - Valuation and Qualifying Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Allowance for Doubtful Accounts:
Valuation and Qualifying Accounts
Balance at Beginning of Year	$ 16	$ 58	$ 10
Additions Charged to Costs and Expense	(10)	(36)	48
Deductions		(6)
Balance at End of Year	6	16	58
Inventory Reserve:
Valuation and Qualifying Accounts
Balance at Beginning of Year	41	148	54
Additions Charged to Costs and Expense		5	190
Deductions	(32)	(112)	(96)
Balance at End of Year	$ 9	$ 41	$ 148