Note 5 - Fair Value (Details) - Summary of Investments in Marketable Securities (USD $) In Thousands, unless otherwise specified	Mar. 30, 2014
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 157,280
Unrealized Gross Gains	89	[1]
Unrealized Gross Losses	(313)	[1]
Fair Value	157,056
US Government Agencies Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	22,550
Unrealized Gross Gains	1	[1]
Unrealized Gross Losses	(39)	[1]
Fair Value	22,512
US States and Political Subdivisions Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,762
Unrealized Gross Gains	10	[1]
Unrealized Gross Losses		[1]
Fair Value	2,772
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	71,309
Unrealized Gross Gains	32	[1]
Unrealized Gross Losses	(88)	[1]
Fair Value	71,253
Asset-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	27,661
Unrealized Gross Gains	22	[1]
Unrealized Gross Losses	(48)	[1]
Fair Value	27,635
Collateralized Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	28,362
Unrealized Gross Gains	24	[1]
Unrealized Gross Losses	(138)	[1]
Fair Value	28,248
Money Market Funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	4,636
Unrealized Gross Gains		[1]
Unrealized Gross Losses		[1]
Fair Value	$ 4,636

[1] Gross of tax impact of $828