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Contract Liabilities: Activity (Details) - USD ($)
3 Months Ended
Mar. 29, 2025
Mar. 30, 2024
Activity of the current and noncurrent deferred franchise revenue    
Balance at beginning of period $ 9,687,300 $ 9,323,600
Franchise and software license fees collected from franchisees, excluding amount earned as revenue during the period 617,100 481,000
Fees earned that were included in the balance at the beginning of the period (387,800) (402,900)
Balance at end of period $ 9,916,600 $ 9,401,700