Valuation And Qualifying Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2012		Mar. 31, 2011	Mar. 31, 2010
Allowance For Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	$ 346		$ 427	$ 572
Additions Resulting in Charges to Operations	96		8	187
Charges to Other Accounts	63		35	0
Deductions Due to Write-Offs	(279)		(124)	(332)
Balance at End of Year	226		346	427
Deferred Tax Asset Valuation Allowance [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	249		249	249
Additions Resulting in Charges to Operations	0		0	0
Charges to Other Accounts	3,280	[1]	0	0
Deductions Due to Write-Offs	0		0	0
Balance at End of Year	$ 3,529		$ 249	$ 249

[1] Recorded in connection with the acquisition of Psytechnics.