Treasury Stock (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 28, 2013	Jun. 29, 2012	Jun. 28, 2013	Jun. 29, 2012
Treasury Stock (Textual) [Abstract]
Treasury stock, purchase price	$ 1.2	$ 2.7	$ 1.2	$ 3.6
Treasury stock, shares	59,000	204,000	59,000	263,000
Shares remained to authorized	500,000	600,000	500,000	600,000
Issued treasury stock shares	37,000	45,000	187,000	297,000