Fair Values of Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Mar. 23, 2013	Dec. 29, 2012	Mar. 24, 2012	Dec. 31, 2011
Financial assets, Carrying Amount
Cash and cash equivalents, Carrying Amount	$ 1,913	$ 2,544	$ 2,581	$ 3,821
Time deposits, Carrying Amount	1,950	1,200	500
Financial liabilities, Carrying Amount
Note payable and Short-term debt, Carrying Amount	14,672		13,688
Current portion of Long-term debt, Carrying Amount	2,546		2,000
Long-term debt, Carrying Amount	4,620	3,500	5,000
Fair Value, Inputs, Level 1 [Member]
Financial assets, Fair Value
Cash and Cash Equivalents, Fair Value	1,913		2,581
Time deposits, Fair Value	1,950		500
Financial liabilities, Fair Value
Note payable and Short-term debt, Fair Value	0		0
Current Portion of Long-term Debt, Fair Value	0		0
Long-term Debt, Fair Value	0		0
Fair Value, Inputs, Level 2 [Member]
Financial assets, Fair Value
Cash and Cash Equivalents, Fair Value	0		0
Time deposits, Fair Value	0		0
Financial liabilities, Fair Value
Note payable and Short-term debt, Fair Value	14,672		13,688
Current Portion of Long-term Debt, Fair Value	2,546		2,000
Long-term Debt, Fair Value	4,620		5,000
Fair Value, Inputs, Level 3 [Member]
Financial assets, Fair Value
Cash and Cash Equivalents, Fair Value	0		0
Time deposits, Fair Value	0		0
Financial liabilities, Fair Value
Note payable and Short-term debt, Fair Value	0		0
Current Portion of Long-term Debt, Fair Value	0		0
Long-term Debt, Fair Value	$ 0		$ 0