Quarterly report pursuant to Section 13 or 15(d)

Investments (Details Textual)

v2.4.0.6
Investments (Details Textual) (USD $)
9 Months Ended
Oct. 01, 2011
Sep. 29, 2012
Minimum [Member]
Oct. 01, 2011
Maximum [Member]
Sep. 29, 2012
Mutual funds [Member]
Investments (Textual) [Abstract]        
Auction rate preferred securities in municipal and state agencies, maturity period   15 years 30 years  
Realized loss from sale of mutual funds        $ 4,000