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Investment in Leasing Operations: Leasing Income (Details) - USD ($)
3 Months Ended
Apr. 01, 2023
Mar. 26, 2022
Leasing income    
Interest income on direct financing and sales-type leases $ 94,800 $ 278,500
Selling profit (loss) at commencement of sales-type leases   1,263,200
Operating lease income 852,700 381,800
Income on sales of equipment under lease 558,200 603,400
Other 131,300 344,800
Leasing income $ 1,637,000 $ 2,871,700