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Receivables (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 27, 2012
Jun. 29, 2011
Jun. 27, 2012
Jun. 29, 2011
Dec. 28, 2011
Receivables [Abstract]          
Allowance for doubtful accounts $ (22,000)   $ (22,000)   $ (8,000)
Total current receivables, net 13,781,000   13,781,000   14,971,000
Direct financing lease receivables (included as a component of prepaid and other current assets) 82,000   82,000   82,000
Noncurrent assets (included as a component of other noncurrent assets):          
Notes receivable from franchisees and third parties 593,000   593,000   560,000
Direct financing lease receivables 6,201,000   6,201,000   5,496,000
Total noncurrent receivables 6,794,000   6,794,000   6,056,000
Interest income on notes receivables 100,000 100,000 100,000 100,000  
Interest income on direct financing leases 300,000 300,000 600,000 500,000  
Trade accounts receivable from franchisees [Member]
          
Receivables [Abstract]          
Receivable, gross 9,663,000   9,663,000   9,452,000
Notes receivable from franchisees [Member]
          
Receivables [Abstract]          
Receivable, gross 593,000   593,000   992,000
Vendor receivables [Member]
          
Receivables [Abstract]          
Receivable, gross 1,157,000   1,157,000   2,311,000
Credit card receivables [Member]
          
Receivables [Abstract]          
Receivable, gross 895,000   895,000   1,137,000
Other [Member]
          
Receivables [Abstract]          
Receivable, gross $ 1,495,000   $ 1,495,000   $ 1,087,000