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Shareholders' Equity (Deficit): Additional Information (Details) - Stock options - USD ($)
12 Months Ended
Dec. 31, 2022
Dec. 25, 2021
Dec. 26, 2020
Additional disclosures      
Total intrinsic value of options exercised $ 6,600,000 $ 16,200,000 $ 8,400,000
Total fair value of shares vested 10,900,000 9,000,000.0 9,100,000
Compensation expense 1,652,400 $ 1,435,500 $ 1,315,200
Total unrecognized compensation expense $ 4,600,000    
Weighted average period for recognition of unrecognized compensation expense 2 years 9 months 18 days