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Operating Leases: Summary (Details)
12 Months Ended
Dec. 30, 2023
USD ($)
item
Dec. 31, 2022
USD ($)
Dec. 25, 2021
USD ($)
Operating Leases      
Remaining lease term 6 years    
Discount rate (as a percent) 5.50%    
Rent expense | $ $ 1,171,700 $ 1,207,200 $ 1,178,400
Corporate headquarters, Minnesota      
Operating Leases      
Lease renewal option true    
Number of lease extension periods | item 2    
Lease renewal term 5 years