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Investments (Details Textual) (USD $)
3 Months Ended
Jun. 29, 2013
Jun. 29, 2013
Common stock of industrial and other companies [Member]
Mar. 30, 2013
Common stock of industrial and other companies [Member]
Jun. 29, 2013
Common stock of bank trust, insurance, and public utility companies [Member]
Mar. 30, 2013
Common stock of bank trust, insurance, and public utility companies [Member]
Schedule of Available-for-sale Securities [Line Items]          
Fair Value   $ 4,100,000 $ 3,700,000 $ 1,500,000 $ 1,600,000
Total unrealized losses   68,000 51,000 9,000 (17,000)
Investments (Textual) [Abstract]          
Value of investments to be other-than-temporarily impaired 0        
Gross gains realized 68,000        
Gross losses realized $ (36,000)