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Contract Liabilities: Activity (Details) - USD ($)
12 Months Ended
Dec. 31, 2022
Dec. 25, 2021
Activity of the current and noncurrent deferred franchise revenue    
Balance at beginning of period $ 8,508,500 $ 8,708,300
Franchise and software license fees collected from franchisees, excluding amount earned as revenue during the period 1,951,800 1,583,700
Fees earned that were included in the balance at the beginning of the period (1,842,200) (1,783,500)
Balance at end of period $ 8,618,100 $ 8,508,500