Accumulated Other Comprehensive Income (Tables)

9 Months Ended

Sep. 24, 2016

Accumulated Other Comprehensive Income [Abstract]

Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]

		Unrealized Gains
		on Available-for-Sale
(dollars in thousands)		Marketable Securities
Accumulated other comprehensive income balance as of December 26, 2015	$	4,761
Other comprehensive income before reclassifications		1,019
Amounts reclassified from accumulated other comprehensive income		(257)
Net current period other comprehensive income		762
Accumulated other comprehensive income balance as of September 24, 2016	$	5,523

Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]

		Gains Reclassified from
		Accumulated Other Comprehensive Income to the
		Consolidated Statements of Income
		13 Weeks Ended				39 Weeks Ended
(dollars in thousands)	Location	September 24, 2016		September 26, 2015		September 24, 2016		September 26, 2015
Unrealized gains on available-for-sale marketable securities
	Investment income	$	169	$	-	$	438	$	15
	Provision for income taxes		(70)		-		(181)		(7)
Total amount reclassified, net of tax		$	99	$	-	$	257	$	8