Note 5 - Financial Instruments Measured at Fair Value (Tables)

12 Months Ended

Dec. 26, 2015

Notes Tables

Available-for-sale Securities [Table Text Block]

	At December 26, 2015
			Gross		Gross		Estimated
	Amortized		Unrealized		Unrealized		Fair
	Cost		Gains		Losses		Value
Foreign government security	$	650	$	-	$	-	$	650
Bank certificates of deposit		1,002		-		-		1,002
	$	1,652	$	-	$	-	$	1,652

	At 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]

	Amortized		Estimated
(in thousands)	Cost		Fair Value
Due in one year or less	$	1,450	$	1,450
Due after one year through three years		202		202
	$	1,652	$	1,652

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

	Fair value measurements at December 26, 2015 using:
							Total estimated
	Level 1		Level 2		Level 3		fair value
Cash	$	73,746	$	-	$	-	$	73,746
Foreign government security		-		650		-		650
Money market funds		-		41,624		-		41,624
Bank certificates of deposit		-		1,002		-		1,002
	$	73,746	$	43,276	$	-	$	117,022

	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