CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	12 Months Ended
	Mar. 30, 2013	Mar. 31, 2012	Apr. 02, 2011
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 4,247,000	$ 4,749,000	$ 12,282,000
Non-cash adjustments to net income:
Depreciation and amortization	1,301,000	1,918,000	2,303,000
Provision for doubtful accounts and sales returns	284,000	108,000	525,000
Provision for excess and obsolete inventories	1,847,000	4,667,000	2,859,000
Deferred income taxes	(578,000)	(877,000)	484,000
Stock-based compensation	2,801,000	3,031,000	3,099,000
Tax benefit (provision) related to stock-based compensation plans	(166,000)	(82,000)	13,000
Excess tax benefit related to stock-based compensation		(1,000)	(7,000)
Unrealized loss (gain) from short-term investments, categorized as trading	(806,000)	(250,000)	(689,000)
Amortization of premium on short-term investments	2,540,000	2,825,000	2,305,000
Loss (gain) on disposal of property, plant and equipment		1,000	(98,000)
Changes in operating assets and liabilities:
Trade accounts receivable	402,000	(19,000)	2,125,000
Inventories	1,247,000	1,495,000	(8,009,000)
Prepaid expenses and other assets	4,382,000	(3,820,000)	745,000
Prepaid income taxes	(171,000)	3,429,000	(4,005,000)
Trade accounts payable and accrued expenses	1,309,000	(1,224,000)	418,000
Deferred revenue	91,000	(1,104,000)	(298,000)
Income taxes payable	(484,000)	(3,054,000)	2,703,000
Net cash provided by operating activities	18,246,000	11,792,000	16,755,000
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of property, plant and equipment	(655,000)	(1,099,000)	(1,210,000)
Proceeds from disposal of property, plant and equipment	7,000		100,000
Purchases of investments	(110,383,000)	(170,567,000)	(176,970,000)
Sales of investments	43,145,000	108,766,000	53,699,000
Maturities and redemptions of investments	65,796,000	62,668,000	125,162,000
Net cash (used in) provided by investing activities	(2,090,000)	(232,000)	781,000
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from exercise of stock options and employee stock purchase plan	594,000	1,476,000	2,533,000
Stock repurchases	(8,673,000)	(17,139,000)	(6,267,000)
Payments of dividends to shareholders	(11,523,000)
Excess tax benefit related to stock-based compensation		1,000	7,000
Net cash provided by (used in) financing activities	(19,602,000)	(15,662,000)	(3,727,000)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(3,446,000)	(4,102,000)	13,809,000
CASH AND CASH EQUIVALENTS:
Beginning of period	19,860,000	23,962,000	10,153,000
End of period	16,414,000	19,860,000	23,962,000
Supplemental cash flow disclosures:
Net income taxes paid (refunds)	$ (2,656,000)	$ 4,792,000	$ 5,089,000