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Investment in Leasing Operations: Leasing Income (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 26, 2021
Jun. 27, 2020
Jun. 26, 2021
Jun. 27, 2020
Leasing income        
Interest income on direct financing and sales-type leases $ 482,800 $ 979,700 $ 1,102,500 $ 2,108,300
Selling profit (loss) at commencement of sales-type leases 356,300 872,700 1,430,000 1,185,900
Operating lease income 476,500 654,500 960,800 1,089,900
Income on sales of equipment under lease 1,479,900 903,600 2,225,500 4,164,900
Other 53,100 63,300 366,800 796,000
Leasing income $ 2,848,600 $ 3,473,800 $ 6,085,600 $ 9,345,000