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Investment in Leasing Operations: (Tables) | 9 Months Ended
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Sep. 28, 2024
Investment in Leasing Operations: |
Schedule of components of leasing income | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Three Months Ended | ​ | Nine Months Ended | ​ | Nine Months Ended | ​
​ |  | September 28, 2024 |  | September 30, 2023 |  | September 28, 2024 |  | September 30, 2023 | ​
Interest income on direct financing and sales-type leases | ​ | $ | 100 | ​ | $ | 52,000 | ​ | $ | 6,700 | ​ | $ | 225,500 | ​
Selling profit (loss) at commencement of sales-type leases | ​ |  | — | ​ |  | 94,900 | ​ |  | — | ​ |  | 94,900 | ​
Operating lease income | ​ | ​ | 90,600 | ​ | ​ | 820,000 | ​ | ​ | 970,400 | ​ | ​ | 2,346,800 | ​
Income on sales of equipment under lease | ​ | ​ | 72,100 | ​ | ​ | 71,000 | ​ | ​ | 368,700 | ​ | ​ | 716,600 | ​
Other | ​ | ​ | 153,400 | ​ | ​ | 254,000 | ​ | ​ | 331,600 | ​ | ​ | 564,900 | ​
Leasing income | ​ | $ | 316,200 | ​ | $ | 1,291,900 | ​ | $ | 1,677,400 | ​ | $ | 3,948,700 | ​
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