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Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 26, 2015
Dec. 27, 2014
Dec. 28, 2013
Dec. 29, 2012
Financial assets, Carrying Amount        
Cash and cash equivalents, Carrying Amount $ 1,982 $ 3,232 $ 2,346 $ 2,544
Time deposits, Carrying Amount 0 1,450    
Financial liabilities, Carrying Amount        
Notes payable, Carrying Amount 19,776 16,200    
Current portion of Long-term debt, Carrying Amount 1,810 1,586    
Long-term debt, Carrying Amount 1,750 3,360    
Fair Value, Inputs, Level 1 [Member]        
Financial assets, Fair Value        
Cash and cash equivalents, Fair Value 1,982 3,232    
Time deposits, Fair Value 0 1,450    
Financial liabilities, Fair Value        
Notes payable, 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        
Notes payable, Fair Value 19,776 16,200    
Current portion of Long-term debt, Fair Value 1,810 1,586    
Long-term debt, Fair Value 1,750 3,360    
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        
Notes payable, Fair Value 0 0    
Current portion of Long-term debt, Fair Value 0 0    
Long-term debt, Fair Value $ 0 $ 0