Note 5. Income Tax (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 24, 2012	Jun. 30, 2013	Jun. 24, 2012
Note 5. Income Tax (Details) [Line Items]
Income Tax Expense (Benefit)	$ 1,924,000	$ 3,409,000	$ 5,208,000	$ 6,817,000
Deferred Income Tax Expense (Benefit)	3,300,000	3,400,000
Income Tax Expense (Benefit), Intraperiod Tax Allocation			(1,361,000)
Impact from "Naked Credit" [Member]
Note 5. Income Tax (Details) [Line Items]
Income Tax Expense (Benefit), Intraperiod Tax Allocation	$ 1,400,000