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Investment in Leasing Operations: (Tables) | 12 Months Ended
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Dec. 28, 2024
Investment in Leasing Operations: |
Schedule of investment in leasing operations | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 28, 2024 |  | December 30, 2023
Direct financing and sales-type leases: | ​ | ​ | ​ | ​ | ​ | ​
Minimum lease payments receivable | ​ | $ | — | ​ | $ | 77,100
Estimated unguaranteed residual value of equipment | ​ |  | — | ​ |  | 17,700
Unearned lease income, net of initial direct costs deferred | ​ |  | — | ​ |  | (6,700)
Security deposits | ​ |  | — | ​ |  | (28,100)
Total investment in direct financing and sales-type leases | ​ |  | — | ​ |  | 60,000
Allowance for credit losses | ​ |  | — | ​ |  | (1,500)
Net investment in direct financing and sales-type leases | ​ |  | — | ​ |  | 58,500
Operating leases: | ​ | ​ | ​ | ​ | ​ | ​
Operating lease assets | ​ |  | 543,800 | ​ |  | 876,500
Less accumulated depreciation and amortization | ​ |  | (543,800) | ​ |  | (859,900)
Net investment in operating leases | ​ |  | — | ​ |  | 16,600
Total net investment in leasing operations | ​ | $ | — | ​ | $ | 75,100
Schedule of components of leasing income | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended | ​ | Year Ended | ​ | Year Ended
​ |  | December 28, 2024 |  | December 30, 2023 | ​ | December 31, 2022
Interest income on direct financing and sales-type leases | ​ | $ | 6,700 | ​ | $ | 246,200 | ​ | $ | 760,500
Selling profit (loss) at commencement of sales-type leases | ​ |  | — | ​ |  | 94,900 | ​ | ​ | 1,326,900
Operating lease income | ​ | ​ | 1,023,400 | ​ | ​ | 2,999,400 | ​ | ​ | 2,243,300
Income on sales of equipment under lease | ​ | ​ | 391,800 | ​ | ​ | 834,500 | ​ | ​ | 1,798,000
Other | ​ | ​ | 389,900 | ​ | ​ | 591,200 | ​ | ​ | 809,000
Leasing income | ​ | $ | 1,811,800 | ​ | $ | 4,766,200 | ​ | $ | 6,937,700
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