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Investment in Leasing Operations: Summary of Leasing Operations (Details) - USD ($)
Mar. 28, 2020
Dec. 28, 2019
Direct financing and sales-type leases:    
Minimum lease payments receivable $ 22,936,500 $ 26,001,200
Estimated unguaranteed residual value of equipment 3,974,000 4,109,800
Unearned lease income net of initial direct costs deferred (2,677,600) (4,039,400)
Security deposits (2,990,300) (3,852,000)
Equipment installed on leases not yet commenced 1,283,700 3,437,800
Total investment in direct financing and sales-type leases 22,526,300 25,657,400
Allowance for credit losses (1,197,500) (580,600)
Net investment in direct financing and sales-type leases 21,328,800 25,076,800
Operating leases:    
Operating lease assets 408,600 820,700
Less accumulated depreciation and amortization (393,500) (591,900)
Net investment in operating leases 15,100 228,800
Total net investment in leasing operations 21,343,900 25,305,600
Net investment in leases - current 12,422,200 12,800,100
Net investment in leases - long-term $ 8,921,700 $ 12,505,500