CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Apr. 02, 2011
Current Assets:
Cash and cash equivalents	$ 16,842	$ 23,962
Short-term investments	112,351	109,760
Trade accounts receivable, net	6,441	8,100
Inventories	16,882	20,600
Prepaid expenses and other current assets	5,602	2,975
Prepaid income taxes	5,373	6,461
Deferred income taxes	7,278	7,228
Total current assets	170,769	179,086
Long-term investments	26,000	30,200
Property, plant and equipment, net	5,162	5,708
Other assets	563	622
Long-term deferred income taxes	4,905	4,980
Total assets	207,399	220,596
Current Liabilities:
Trade accounts payable	2,640	3,283
Accrued salaries and employee benefits	11,823	12,430
Other accrued liabilities	665	772
Deferred revenue	2,545	3,664
Income taxes payable	134	2,264
Total current liabilities	17,807	22,413
Income taxes payable, noncurrent	4,943	4,974
Other accrued liabilities, noncurrent	295	290
Total liabilities	23,045	27,677
Commitments and contingencies (Note 9)	0	0
Preferred stock, no par value -- 10,000 shares authorized; none issued and outstanding	0	0
Common stock, no par value -- 30,000 shares authorized; issued and outstanding 12,056 shares as of December 31, 2011 and 12,808 shares as of April 2, 2011	67,623	68,499
Accumulated other comprehensive loss	(1,456)	(1,683)
Retained earnings	118,187	126,103
Total shareholders' equity	184,354	192,919
Total liabilities and shareholders' equity	$ 207,399	$ 220,596