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Investment in Leasing Operations: Credit Losses (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 24, 2022
Sep. 25, 2021
Sep. 24, 2022
Sep. 25, 2021
Dec. 25, 2021
Activity in the allowance for credit losses for leasing operations          
Balance at beginning of period     $ 63,600 $ 270,200  
Provisions charged to expense $ (22,000) $ (55,900) (46,600) (167,300)  
Recoveries     1,400    
Balance at end of period 18,400 $ 102,900 18,400 $ 102,900  
Investment In Leases          
Total investment in direct financing and sales-type leases 881,300   881,300   $ 3,163,000
Allowance for Credit Losses          
Total 18,400   18,400   63,600
Investment in leases          
Investment In Leases          
Collectively evaluated for loss potential 881,300   881,300   3,163,000
Total investment in direct financing and sales-type leases 881,300   881,300   3,163,000
Allowance for Credit Losses          
Collectively evaluated for loss potential 18,400   18,400   63,600
Total $ 18,400   $ 18,400   $ 63,600