Schedule II - Valuation and Qualifying Accounts (Details) (USD $)	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of fiscal year	$ 21,000	$ 31,000	$ 11,000
Additions charged to costs and expenses	8,000	17,000	30,000
Written off, less recoveries	(5,000)	(27,000)	(9,000)
Effects of foreign currency fluctuations	1,000	0	(1,000)
Balance at end of fiscal year	25,000	21,000	31,000
Allowance for Sales Returns [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of fiscal year	53,000	62,000	59,000
Additions charged to costs and expenses	43,000	26,000	82,000
Written off, less recoveries	(76,000)	(35,000)	(79,000)
Effects of foreign currency fluctuations	0	0	0
Balance at end of fiscal year	$ 20,000	$ 53,000	$ 62,000