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Contract Liabilities: Activity (Details) - USD ($)
6 Months Ended
Jun. 25, 2022
Jun. 26, 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 937,900 755,400
Fees earned that were included in the balance at the beginning of the period (966,100) (875,700)
Balance at end of period $ 8,480,300 $ 8,588,000