Note 3 - Fair Value and Marketable Securities (Details) - Reconciliation of Fair Value Using Significant Unobservable Inputs (Preferred Equity Securities [Member], Fair Value, Inputs, Level 3 [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended		9 Months Ended
	Mar. 30, 2013		Jun. 29, 2013		Sep. 28, 2013
Preferred Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at January 1, 2013	$ 1,568	[1]	$ 1,568	[1]	$ 1,568	[1]
Balance at September 28, 2013					394	[1]
Face value					1,125	[1]
Financial ratings						[1]
Weighted average interest rate					0.00%	[1]
Maturity date					. NaN, NaN	[1]
Included in earnings (loss)
Included in earnings (loss)		[1]	872	[1]		[1]
Included in other comprehensive income(loss)
Included in other comprehensive income (loss)	477	[1]	(467)	[1]	(56)	[1]
Purchases						[1]
Redemptions and settlements
Redemptions and settlements		[1]	(2,000)	[1]		[1]
Transfers in and/or out of Level 3						[1]
Amount of total gains or losses for the period included in earnings(loss) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date						[1]

[1] Preferred securities issued by subsidiaries of two publicly-held debt default insurers. During the second quarter of 2013, one of these securities redeemed at $2,000 par, resulting in an $872 realized gain recorded to Other income, net.