Note 4 - Financial Instruments Measured at Fair Value (Tables)

9 Months Ended

Sep. 26, 2015

Notes Tables

Available-for-sale Securities [Table Text Block]

	September 26, 2015
			Gross		Gross		Estimated
	Amortized		Unrealized		Unrealized		Fair
	Cost		Gains		Losses		Value
Foreign government security	$	465	$	-	$	-	$	465
Bank certificates of deposit		1,002		-		-		1,002
	$	1,467	$	-	$	-	$	1,467

	December 27, 2014
			Gross		Gross		Estimated
	Amortized		Unrealized		Unrealized		Fair
	Cost		Gains		Losses		Value
Municipal securities	$	155	$	-	$	-	$	155
Bank certificates of deposit		1,000		-		-		1,000
	$	1,155	$	-	$	-	$	1,155

Investments Classified by Contractual Maturity Date [Table Text Block]

	September 26, 2015				December 27, 2014
	Amortized		Estimated		Amortized		Estimated
	Cost		Fair Value		Cost		Fair Value
Due in one year or less	$	1,467	$	1,467	$	1,155	$	1,155

Fair Value, Assets Measured on Recurring Basis [Table Text Block]

	Fair value measurements at September 26, 2015 using:
							Total estimated
	Level 1		Level 2		Level 3		fair value
Cash	$	84,642	$	-	$	-	$	84,642
Money market funds		-		4,618		-		4,618
Bank certificates of deposit		-		1,002		-		1,002
Foreign government security		-		465		-		465
	$	84,642	$	6,085	$	-	$	90,727

	Fair value measurements at December 27, 2014 using:
							Total estimated
	Level 1		Level 2		Level 3		fair value
Cash	$	66,467	$	-	$	-	$	66,467
Municipal securities		-		155		-		155
Money market funds		-		4,418		-		4,418
Bank certificates of deposit		-		1,000		-		1,000
	$	66,467	$	5,573	$	-	$	72,040