Business Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013 Segment		Sep. 30, 2012		Mar. 31, 2013
Business Segment Information [Abstract]
Number of operating segments					1
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue by customer (in hundredths)	25.00%		26.00%		26.00%		27.00%
Revenues	$ 5,977		$ 5,710		$ 11,818		$ 11,287
Long-lived assets	1,108				1,108				1,033
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	4,478		4,219		8,763		8,280
Long-lived assets	487				487				434
All Other Foreign Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	1,499	[1]	1,491	[1]	3,055	[1]	3,007	[1]
Long-lived assets	$ 621	[2]			$ 621	[2]			$ 599	[2]

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

[2] Substantially all maintained in The Netherlands.