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Investment in Leasing Operations: Leasing Income (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 25, 2021
Sep. 26, 2020
Sep. 25, 2021
Sep. 26, 2020
Leasing income        
Interest income on direct financing and sales-type leases $ 362,200 $ 839,600 $ 1,464,700 $ 2,947,900
Selling profit (loss) at commencement of sales-type leases 164,300 267,700 1,594,300 1,453,600
Operating lease income 436,700 668,600 1,397,500 1,758,500
Income on sales of equipment under lease 988,500 913,400 3,214,000 5,078,300
Other 314,500 6,500 681,300 802,500
Leasing income $ 2,266,200 $ 2,695,800 $ 8,351,800 $ 12,040,800