Quarterly report pursuant to Section 13 or 15(d)

Investments (Details Textual)

v2.4.0.6
Investments (Details Textual) (USD $)
6 Months Ended
Jul. 02, 2011
Jun. 30, 2012
Minimum [Member]
Jun. 30, 2012
Maximum [Member]
Jun. 30, 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 $ 0     $ 4,000