Inventories (Details) (USD $)	3 Months Ended
	Jun. 30, 2012	Jul. 02, 2011	Mar. 31, 2012
Inventories [Abstract]
Raw materials	$ 626,000		$ 936,000
Work-in-process	7,728,000		8,221,000
Finished goods	3,406,000		4,195,000
Finished goods at distributors and on consignment	1,164,000		1,086,000
Total Inventories	12,924,000		14,438,000
Provision for excess and obsolete inventories	156,000	958,000
Previously written down inventory sold	$ 345,000	$ 295,000