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Contract Liabilities: Activity (Details) - USD ($)
 9 Months Ended
Sep. 30, 2023
Sep. 24, 2022
Activity of the current and noncurrent deferred franchise revenue    
Balance at beginning of period $ 8,618,100 $ 8,508,500
Franchise and software license fees collected from franchisees, excluding amount earned as revenue during the period 1,957,300 1,538,100
Fees earned that were included in the balance at the beginning of the period (1,341,100) (1,373,400)
Balance at end of period $ 9,234,300 $ 8,673,200