CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jun. 29, 2013	Jun. 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 2,886	$ 597
Non-cash adjustments to net income:
Depreciation and amortization	236	358
Provision for doubtful accounts and sales returns	54	130
Provision for excess and obsolete inventories	194	156
Deferred income taxes		(127)
Stock-based compensation	643	745
Tax (provision) benefit related to stock-based compensation plans	(12)	7
Unrealized loss from short-term investments, categorized as trading	19	97
Amortization of premium on short-term investments	586	597
Changes in operating assets and liabilities:
Trade accounts receivable	(407)	137
Inventories	(268)	1,358
Prepaid expenses and other assets	14	(92)
Prepaid income taxes	(82)	15
Trade accounts payable and accrued expenses	803	165
Deferred revenue	10	40
Income taxes payable	(833)	325
Net cash provided by operating activities	3,843	4,508
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of property, plant and equipment	(52)	(43)
Purchases of investments	(53,977)	(49,624)
Sales of investments	36,688	6,398
Maturities and redemptions of investments	26,307	32,117
Net cash provided by (used in) investing activities	8,966	(11,152)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from exercise of stock options and employee stock purchase plan	311	312
Stock repurchases	(350)	(113)
Net cash (used in) provided by financing activities	(39)	199
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	12,770	(6,445)
CASH AND CASH EQUIVALENTS:
Beginning of period	16,414	19,860
End of period	29,184	13,415
Supplemental cash flow disclosures:
Income taxes paid, net of refunds	$ 599	$ 7