Investments (Details Textual) - USD ($)	3 Months Ended
	Jun. 27, 2015	Jun. 28, 2014	Mar. 28, 2015
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	$ 463,000		$ 136,000
Investments (Textual) [Abstract]
Value of investments to be other-than-temporarily impaired	0
Gross gains realized	180,000	$ 303,000
Gross losses realized	(46,000)	$ (68,000)
Common stock of industrial and other companies [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value	5,500,000		5,400,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(373,000)		(85,000)
Common stock of bank trust, insurance, and public utility companies [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value	100,000		100,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	$ (3,000)		$ (3,000)