Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2016

Marketable Securities [Abstract]

Marketable securities [Table Text Block]

Marketable securities, as of December 31, 2016 and December 26, 2015, consisted of:

			Gross		Gross
(dollars in thousands)	Amortized		Unrealized		Unrealized		Fair
December 31, 2016	Cost		Holding Gains		Holding Losses		Value
Available-for-sale:
Level 1
Equity securities	$	1,198	$	8,162	$	-	$	9,360
Level 2
Municipal bonds		57,739		531		(459)		57,811
	$	58,937	$	8,693	$	(459)	$	67,171

			Gross		Gross
(dollars in thousands)	Amortized		Unrealized		Unrealized		Fair
December 26, 2015	Cost		Holding Gains		Holding Losses		Value
Available-for-sale:
Level 1
Equity securities	$	1,198	$	6,682	$	-	$	7,880
Level 2
Municipal bonds		82,347		1,468		(66)		83,749
	$	83,545	$	8,150	$	(66)	$	91,629

Maturities of marketable securities classified as available-for-sale [Table Text Block]

Maturities of marketable securities classified as available-for-sale at December 31, 2016, were as follows:

		Amortized		Fair
(dollars in thousands)		Cost		Value
Available-for-sale:
Due within one year	$	6,144	$	6,179
Due after one year through five years		27,780		27,972
Due after five years through ten years		20,317		20,162
Due after ten years		3,498		3,498
Equity securities		1,198		9,360
	$	58,937	$	67,171