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Investment in Leasing Operations: Leasing Income (Details) - USD ($)
12 Months Ended
Dec. 30, 2023
Dec. 31, 2022
Dec. 25, 2021
Leasing income      
Interest income on direct financing and sales-type leases $ 246,200 $ 760,500 $ 1,755,200
Selling profit (loss) at commencement of sales-type leases 94,900 1,326,900 1,829,800
Operating lease income 2,999,400 2,243,300 2,017,300
Income on sales of equipment under lease 834,500 1,798,000 4,799,400
Other 591,200 809,000 746,600
Leasing income $ 4,766,200 $ 6,937,700 $ 11,148,300