Business Segment Information (Details) (USD $)	3 Months Ended				6 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011
Business Segment Information [Abstract]
Number of operating segments					1
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue by customer (in hundredths)	26.00%		31.00%		27.00%		34.00%
Revenues	$ 5,710,000		$ 4,968,000		$ 11,287,000		$ 9,621,000
Long-lived assets	1,087,000				1,087,000
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	4,219,000		3,433,000		8,280,000		6,324,000
Long-lived assets	466,000				466,000
All Other Foreign Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	1,491,000	[1]	1,535,000	[1]	3,007,000	[1]	3,297,000	[1]
Long-lived assets	$ 621,000				$ 621,000

[1] No country accounts for 10% or more of the consolidated net sales