Note 7 - Financial Instruments Measured at Fair Value (Tables)

12 Months Ended

Dec. 28, 2019

Notes Tables

Available-for-sale Securities [Table Text Block]

	At December 28, 2019
			Gross		Gross		Estimated
	Amortized		Unrealized		Unrealized		Fair
	Cost		Gains		Losses (1)		Value
Foreign government security	$	904	$	-	$	-	$	904

	At December 29, 2018
			Gross		Gross		Estimated
	Amortized		Unrealized		Unrealized		Fair
	Cost		Gains		Losses (1)		Value
Foreign government security	$	560	$	-	$	-	$	560

Investments Classified by Contractual Maturity Date [Table Text Block]

	Amortized		Estimated
(in thousands)	Cost		Fair Value
Due after one year through three years	$	904	$	904

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

	Fair value measurements at December 28, 2019 using:
							Total estimated
	Level 1		Level 2		Level 3		fair value
Cash	$	147,523	$	-	$	-	$	147,523
Money market funds		-		7,671		-		7,671
Foreign government security		-		904		-		904
	$	147,523	$	8,575	$	-	$	156,098

	Fair value measurements at December 29, 2018 using:
							Total estimated
	Level 1		Level 2		Level 3		fair value
Cash	$	144,696	$	-	$	-	$	144,696
Money market funds		-		19,764		-		19,764
Foreign government security		-		560		-		560
	$	144,696	$	20,324	$	-	$	165,020