Investments (Details Textual) (USD $)	3 Months Ended	9 Months Ended
	Dec. 29, 2012	Dec. 29, 2012
Investments (Textual) [Abstract]
Value of investments to be other-than-temporarily impaired		$ 0
Gross gains realized	94,000	150,000
Gross losses realized	31,000	45,000
Common stock of industrial and other companies [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value	2,600,000	2,600,000
Total unrealized losses	80,000	80,000
Common stock of bank trust, insurance, and public utility companies [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value	1,500,000	1,500,000
Total unrealized losses	$ 16,000	$ 16,000