Business Segment Information (Details) (USD $)	3 Months Ended
	Jun. 30, 2013 Segment		Jun. 30, 2012
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%		27.00%
Revenues	$ 5,841,000		$ 5,577,000
Long-lived assets	1,151,000
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	4,285,000		4,060,000
Long-lived assets	548,000
All Other Foreign Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	1,556,000	[1]	1,517,000	[1]
Long-lived assets	$ 603,000	[2]

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

[2] Substantially all maintained in The Netherlands.