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Contract Liabilities: Activity (Details) - USD ($) | 12 Months Ended
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Dec. 26, 2020 | Dec. 28, 2019
Activity of the current and noncurrent deferred franchise revenue |  |
Balance at beginning of period | $ 9,575,500 | $ 10,177,300
Franchise and software license fees collected from franchisees, excluding amount earned as revenue during the period | 860,100 | 1,203,500
Fees earned that were included in the balance at the beginning of the period | (1,727,300) | (1,805,300)
Balance at end of period | $ 8,708,300 | $ 9,575,500

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