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Investment in Leasing Operations: Leasing Income (Details) - USD ($)
3 Months Ended 6 Months Ended
Jul. 01, 2023
Jun. 25, 2022
Jul. 01, 2023
Jun. 25, 2022
Leasing income        
Interest income on direct financing and sales-type leases $ 78,700 $ 205,300 $ 173,500 $ 483,800
Selling profit (loss) at commencement of sales-type leases   34,800   1,298,000
Operating lease income 674,200 528,300 1,526,800 910,100
Income on sales of equipment under lease 87,400 328,700 645,600 932,100
Other 179,500 114,900 310,900 459,700
Leasing income $ 1,019,800 $ 1,212,000 $ 2,656,800 $ 4,083,700