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Investment in Leasing Operations: Leasing Income (Details) - USD ($)
12 Months Ended
Dec. 28, 2024
Dec. 30, 2023
Dec. 31, 2022
Leasing income      
Interest income on direct financing and sales-type leases $ 6,700 $ 246,200 $ 760,500
Selling profit (loss) at commencement of sales-type leases   94,900 1,326,900
Operating lease income 1,023,400 2,999,400 2,243,300
Income on sales of equipment under lease 391,800 834,500 1,798,000
Other 389,900 591,200 809,000
Leasing income $ 1,811,800 $ 4,766,200 $ 6,937,700