Summary Of Significant Accounting Policies (Narrative) (Details) (USD $)	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Concentration Risk [Line Items]
Unrecognized accounts receivable and deferred revenue	$ 120,000	$ 183,000
Foreign currency gains (losses)	(625,000)	25,000	(39,000)
Advertising expense	273,000	175,000	201,000
Indefinite lived intangible, book value	18,600,000
Amortization included as cost of product	$ 204,000	$ 153,000
Customer Concentration Risk [Member] | Accounts Receivable [Member]
Concentration Risk [Line Items]
Concentration risk percentage, number of customers	0	1
Concentration risk percentage	10.00%	13.00%
Customer Concentration Risk [Member] | Sales Revenue [Member]
Concentration Risk [Line Items]
Concentration risk percentage, number of customers	0	0	0
Maximum [Member] | Customer Concentration Risk [Member] | Sales Revenue [Member]
Concentration Risk [Line Items]
Concentration risk percentage	10.00%	10.00%	10.00%