Commitments And Contingencies (Schedule Of Product Warranty Liability) (Details) (USD $)	3 Months Ended
	Jun. 30, 2012	Jul. 02, 2011	Mar. 31, 2012
Commitments and Contingencies [Abstract]
Balance at Beginning of Period	$ 213,000	$ 234,000
Charge	134,000	24,000
Deductions and Other	(8,000)	(43,000)
Balance at End of Period	339,000	215,000
Product return period	90 days
Product warrany period	90 days
Warranty reserve	$ 51,000		$ 45,000