Schedule II - Valuation and Qualifying Accounts (Details) - USD ($)	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of fiscal year	$ 25,000	$ 21,000	$ 31,000
Additions charged to costs and expenses	8,000	8,000	17,000
Written off, less recoveries	(13,000)	(5,000)	(27,000)
Effects of foreign currency fluctuations	2,000	1,000	0
Balance at end of fiscal year	18,000	25,000	21,000
Allowance for Sales Returns [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of fiscal year	20,000	53,000	62,000
Additions charged to costs and expenses	4,000	43,000	26,000
Written off, less recoveries	(9,000)	(76,000)	(35,000)
Effects of foreign currency fluctuations	0	0	0
Balance at end of fiscal year	$ 15,000	$ 20,000	$ 53,000