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Investment in Leasing Operations: Leasing Income (Details) - USD ($)
12 Months Ended
Dec. 31, 2022
Dec. 25, 2021
Dec. 26, 2020
Leasing income      
Interest income on direct financing and sales-type leases $ 760,500 $ 1,755,200 $ 3,651,700
Selling profit (loss) at commencement of sales-type leases 1,326,900 1,829,800 2,117,500
Operating lease income 2,243,300 2,017,300 2,346,500
Income on sales of equipment under lease 1,798,000 4,799,400 5,246,000
Other 809,000 746,600 1,122,300
Leasing income $ 6,937,700 $ 11,148,300 $ 14,484,000