Business Segment Information (Details) (USD $)	3 Months Ended
	Jun. 30, 2012		Jun. 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)	27.00%		38.00%
Revenues	$ 5,577,000		$ 4,653,000
Long-lived assets	1,135,000
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	4,060,000		2,891,000
Long-lived assets	517,000
All Other Foreign Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	1,517,000	[1]	1,762,000	[1]
The Netherlands [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 603,000

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