CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Dec. 29, 2012	Mar. 31, 2012
Current Assets:
Cash and cash equivalents	$ 16,844	$ 19,860
Short-term investments	120,034	111,137
Trade accounts receivable, net	5,743	8,021
Inventories	11,427	14,438
Prepaid expenses and other current assets	5,123	6,786
Prepaid income taxes	3,231	3,032
Deferred income taxes	7,450	7,529
Total current assets	169,852	170,803
Long-term investments	13,500	25,900
Property, plant and equipment, net	4,416	4,941
Other assets	818	621
Deferred income taxes, noncurrent	5,291	5,375
Total assets	193,877	207,640
Current Liabilities:
Trade accounts payable	2,916	1,994
Accrued salaries and employee benefits	12,688	12,434
Other accrued liabilities	818	615
Deferred revenue	2,069	2,560
Income taxes payable	90	23
Total current liabilities	18,581	17,626
Income taxes payable, noncurrent	3,702	4,161
Deferred tax liabilities, noncurrent	127
Other accrued liabilities, noncurrent	571	561
Total liabilities	22,981	22,348
Commitments and contingencies (Note 9)
Preferred stock, no par value -- 10,000 shares authorized; none issued and outstanding
Common stock, no par value -- 30,000 shares authorized; issued and outstanding 11,516 shares as of December 29, 2012 and 11,992 shares as of March 31, 2012	67,696	68,031
Accumulated other comprehensive loss	(808)	(1,345)
Retained earnings	104,008	118,606
Total shareholders' equity	170,896	185,292
Total liabilities and shareholders' equity	$ 193,877	$ 207,640